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MySQL基础五:子查询与链接_MySQL

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Lepaskan: 2016-05-27 13:45:07
asal
1324 orang telah melayarinya

本篇文章参考:http://www.imooc.com/learn/122
首先下载好数据,网址上面有;

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#首先录入数据:

CREATE TABLE IF NOT EXISTS tdb_goods(

    goods_id    SMALLINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,

    goods_name  VARCHAR(150) NOT NULL,

    goods_cate  VARCHAR(40)  NOT NULL,

    brand_name  VARCHAR(40)  NOT NULL,

    goods_price DECIMAL(15,3) UNSIGNED NOT NULL DEFAULT 0,

    is_show     BOOLEAN NOT NULL DEFAULT 1,

    is_saleoff  BOOLEAN NOT NULL DEFAULT 0

  );

 

INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

VALUES('R510VC 15.6英寸笔记本','笔记本','华硕','3399',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('Y400N 14.0英寸笔记本电脑','笔记本','联想','4899',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('G150TH 15.6英寸游戏本','游戏本','雷神','8499',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('X550CC 15.6英寸笔记本','笔记本','华硕','2799',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('X240(20ALA0EYCD) 12.5英寸超极本','超级本','联想','4999',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('U330P 13.3英寸超极本','超级本','联想','4299',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('SVP13226SCB 13.3英寸触控超极本','超级本','索尼','7999',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('iPad mini MD531CH/A 7.9英寸平板电脑','平板电脑','苹果','1998',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)','平板电脑','苹果','3388',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES(' iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑

 (16G WiFi版)','平板电脑','苹果','2788',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('IdeaCentre C340 20英寸一体电脑 ','台式机','联想','3499',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('Vostro 3800-R1206 台式电脑','台式机','戴尔','2899',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('iMac ME086CH/A 21.5英寸一体电脑','台式机','苹果','9188',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )','

 台式机','宏碁','3699',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('Z220SFF F4F06PA工作站','服务器/工作站','惠普','4288',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('PowerEdge T110 II服务器','服务器/工作站','戴尔','5388',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('Mac Pro MD878CH/A 专业级台式电脑','服务器/工作站','苹果','28888',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES(' HMZ-T3W 头戴显示设备','笔记本配件','索尼','6999',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('商务双肩背包','笔记本配件','索尼','99',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('X3250 M4机架式服务器 2583i14','服务器/工作站','IBM','6888',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('玄龙精英版 笔记本散热器','笔记本配件','九州风神','',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES(' HMZ-T3W 头戴显示设备','笔记本配件','索尼','6999',DEFAULT,DEFAULT);

 

 INSERT tdb_goods (goods_name,goods_cate,brand_name,goods_price,is_show,is_saleoff)

 VALUES('商务双肩背包','笔记本配件','索尼','99',DEFAULT,DEFAULT);

#查看数据表;

mysql>

mysql> SHOW TABLES;

+-----------------+

| Tables_in_world |

+-----------------+

| city            |

| country         |

| countrylanguage |

| provinces       |

| tdb_goods       |

| test            |

| users           |

+-----------------+

7 rows in set (0.00 sec)

 

mysql> SHOW COLUMNS FROM tdb_goods;

+-------------+------------------------+------+-----+---------+----------------+

| Field       | Type                   | Null | Key | Default | Extra          |

+-------------+------------------------+------+-----+---------+----------------+

| goods_id    | smallint(5) unsigned   | NO   | PRI | NULL    | auto_increment |

| goods_name  | varchar(150)           | NO   |     | NULL    |                |

| goods_cate  | varchar(40)            | NO   |     | NULL    |                |

| brand_name  | varchar(40)            | NO   |     | NULL    |                |

| goods_price | decimal(15,3) unsigned | NO   |     | 0.000   |                |

| is_show     | tinyint(1)             | NO   |     | 1       |                |

| is_saleoff  | tinyint(1)             | NO   |     | 0       |                |

+-------------+------------------------+------+-----+---------+----------------+

7 rows in set (0.01 sec)

 

mysql> SELECT * FROM tdb_goods\G;

*************************** 1. row ***************************

   goods_id: 1

 goods_name: R510VC 15.6英寸笔记本

 goods_cate: 笔记本

 brand_name: 华硕

goods_price: 3399.000

    is_show: 1

 is_saleoff: 0

*************************** 2. row ***************************

   goods_id: 2

 goods_name: Y400N 14.0英寸笔记本电脑

 goods_cate: 笔记本

 brand_name: 联想

goods_price: 4899.000

    is_show: 1

 is_saleoff: 0

*************************** 3. row ***************************

   goods_id: 3

 goods_name: G150TH 15.6英寸游戏本

 goods_cate: 游戏本

 brand_name: 雷神

goods_price: 8499.000

    is_show: 1

 is_saleoff: 0

*************************** 4. row ***************************

   goods_id: 4

 goods_name: X550CC 15.6英寸笔记本

 goods_cate: 笔记本

 brand_name: 华硕

goods_price: 2799.000

    is_show: 1

 is_saleoff: 0

*************************** 5. row ***************************

   goods_id: 5

 goods_name: X240(20ALA0EYCD) 12.5英寸超极本

 goods_cate: 超级本

 brand_name: 联想

goods_price: 4999.000

    is_show: 1

 is_saleoff: 0

*************************** 6. row ***************************

   goods_id: 6

 goods_name: U330P 13.3英寸超极本

 goods_cate: 超级本

 brand_name: 联想

goods_price: 4299.000

    is_show: 1

 is_saleoff: 0

*************************** 7. row ***************************

   goods_id: 7

 goods_name: SVP13226SCB 13.3英寸触控超极本

 goods_cate: 超级本

 brand_name: 索尼

goods_price: 7999.000

    is_show: 1

 is_saleoff: 0

*************************** 8. row ***************************

   goods_id: 8

 goods_name: iPad mini MD531CH/A 7.9英寸平板电脑

 goods_cate: 平板电脑

 brand_name: 苹果

goods_price: 1998.000

    is_show: 1

 is_saleoff: 0

*************************** 9. row ***************************

   goods_id: 9

 goods_name: iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)

 goods_cate: 平板电脑

 brand_name: 苹果

goods_price: 3388.000

    is_show: 1

 is_saleoff: 0

*************************** 10. row ***************************

   goods_id: 10

 goods_name:  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版)

 goods_cate: 平板电脑

 brand_name: 苹果

goods_price: 2788.000

    is_show: 1

 is_saleoff: 0

*************************** 11. row ***************************

   goods_id: 11

 goods_name: IdeaCentre C340 20英寸一体电脑

 goods_cate: 台式机

 brand_name: 联想

goods_price: 3499.000

    is_show: 1

 is_saleoff: 0

*************************** 12. row ***************************

   goods_id: 12

 goods_name: Vostro 3800-R1206 台式电脑

 goods_cate: 台式机

 brand_name: 戴尔

goods_price: 2899.000

    is_show: 1

 is_saleoff: 0

*************************** 13. row ***************************

   goods_id: 13

 goods_name: iMac ME086CH/A 21.5英寸一体电脑

 goods_cate: 台式机

 brand_name: 苹果

goods_price: 9188.000

    is_show: 1

 is_saleoff: 0

*************************** 14. row ***************************

   goods_id: 14

 goods_name: AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )

 goods_cate: 台式机

 brand_name: 宏碁

goods_price: 3699.000

    is_show: 1

 is_saleoff: 0

*************************** 15. row ***************************

   goods_id: 15

 goods_name: Z220SFF F4F06PA工作站

 goods_cate: 服务器/工作站

 brand_name: 惠普

goods_price: 4288.000

    is_show: 1

 is_saleoff: 0

*************************** 16. row ***************************

   goods_id: 16

 goods_name: PowerEdge T110 II服务器

 goods_cate: 服务器/工作站

 brand_name: 戴尔

goods_price: 5388.000

    is_show: 1

 is_saleoff: 0

*************************** 17. row ***************************

   goods_id: 17

 goods_name: Mac Pro MD878CH/A 专业级台式电脑

 goods_cate: 服务器/工作站

 brand_name: 苹果

goods_price: 28888.000

    is_show: 1

 is_saleoff: 0

*************************** 18. row ***************************

   goods_id: 18

 goods_name:  HMZ-T3W 头戴显示设备

 goods_cate: 笔记本配件

 brand_name: 索尼

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 19. row ***************************

   goods_id: 19

 goods_name: 商务双肩背包

 goods_cate: 笔记本配件

 brand_name: 索尼

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

*************************** 20. row ***************************

   goods_id: 20

 goods_name: X3250 M4机架式服务器 2583i14

 goods_cate: 服务器/工作站

 brand_name: IBM

goods_price: 6888.000

    is_show: 1

 is_saleoff: 0

*************************** 21. row ***************************

   goods_id: 21

 goods_name:  HMZ-T3W 头戴显示设备

 goods_cate: 笔记本配件

 brand_name: 索尼

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 22. row ***************************

   goods_id: 22

 goods_name: 商务双肩背包

 goods_cate: 笔记本配件

 brand_name: 索尼

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

22 rows in set (0.01 sec)

 

ERROR:

No query specified

Salin selepas log masuk

子查询正文

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mysql> #子查询

mysql> #子查询是嵌套在查询内部的查询;

mysql>

mysql> #使用比较运算符的子查询;

mysql> #求价格平均值;

mysql> SELECT AVG(goods_price) FROM tdb_goods;

 

mysql> SELECT AVG(goods_price) FROM tdb_goods;

+------------------+

| AVG(goods_price) |

+------------------+

|     5636.3636364 |

+------------------+

1 row in set (0.03 sec)

 

mysql> #四舍五入

mysql> #保留到小数点后两位;  mysql> SELECT ROUND(AVG(goods_price),2) FROM tdb_goods;

+---------------------------+

| ROUND(AVG(goods_price),2) |

+---------------------------+

|                   5636.36 |

+---------------------------+

1 row in set (0.02 sec)

 

mysql> SELECT goods_id,goods_price FROM tdb_goods WHERE goods_price>=5636.36;

+----------+-------------+

| goods_id | goods_price |

+----------+-------------+

|        3 |    8499.000 |

|        7 |    7999.000 |

|       13 |    9188.000 |

|       17 |   28888.000 |

|       18 |    6999.000 |

|       20 |    6888.000 |

|       21 |    6999.000 |

+----------+-------------+

7 rows in set (0.00 sec)

 

mysql> #通过子查询实现上式;

mysql> SELECT goods_id,goods_price FROM tdb_goods WHERE goods_price>=(SELECT ROUND(AVG(goods_price),2)

 FROM tdb_goods);

+----------+-------------+

| goods_id | goods_price |

+----------+-------------+

|        3 |    8499.000 |

|        7 |    7999.000 |

|       13 |    9188.000 |

|       17 |   28888.000 |

|       18 |    6999.000 |

|       20 |    6888.000 |

|       21 |    6999.000 |

+----------+-------------+

7 rows in set (0.03 sec)

 

mysql> SELECT goods_price FROM tdb_goods WHERE goods_cate='超级本';

+-------------+

| goods_price |

+-------------+

|    4999.000 |

|    4299.000 |

|    7999.000 |

+-------------+

3 rows in set (0.00 sec)

 

mysql> SELECT * FROM tdb_goods WHERE goods_cate='超级本'\G;

*************************** 1. row ***************************

   goods_id: 5

 goods_name: X240(20ALA0EYCD) 12.5英寸超极本

 goods_cate: 超级本

 brand_name: 联想

goods_price: 4999.000

    is_show: 1

 is_saleoff: 0

*************************** 2. row ***************************

   goods_id: 6

 goods_name: U330P 13.3英寸超极本

 goods_cate: 超级本

 brand_name: 联想

goods_price: 4299.000

    is_show: 1

 is_saleoff: 0

*************************** 3. row ***************************

   goods_id: 7

 goods_name: SVP13226SCB 13.3英寸触控超极本

 goods_cate: 超级本

 brand_name: 索尼

goods_price: 7999.000

    is_show: 1

 is_saleoff: 0

3 rows in set (0.00 sec)

 

ERROR:

No query specified

 

mysql> SELECT goods_id,goods_name,goods_price FROM tdb_goods WHERE goods_price>

(SELECT goods_price FROM tdb_goods WHERE goods_cate='超级本');

ERROR 1242 (21000): Subquery returns more than 1 row

mysql> #鉴于上述错误,子查询用三个关键字修饰

mysql> SELECT goods_id,goods_name,goods_price FROM tdb_goods WHERE goods_price>ANY

(SELECT goods_price FROM tdb_goods WHERE goods_cate='超级本');

+----------+----------------------------------+-------------+

| goods_id | goods_name                       | goods_price |

+----------+----------------------------------+-------------+

|        2 | Y400N 14.0英寸笔记本电脑         |    4899.000 |

|        3 | G150TH 15.6英寸游戏本            |    8499.000 |

|        5 | X240(20ALA0EYCD) 12.5英寸超极本  |    4999.000 |

|        7 | SVP13226SCB 13.3英寸触控超极本   |    7999.000 |

|       13 | iMac ME086CH/A 21.5英寸一体电脑  |    9188.000 |

|       16 | PowerEdge T110 II服务器          |    5388.000 |

|       17 | Mac Pro MD878CH/A 专业级台式电脑 |   28888.000 |

|       18 |  HMZ-T3W 头戴显示设备            |    6999.000 |

|       20 | X3250 M4机架式服务器 2583i14     |    6888.000 |

|       21 |  HMZ-T3W 头戴显示设备            |    6999.000 |

+----------+----------------------------------+-------------+

10 rows in set (0.00 sec)

 

mysql> SELECT goods_id,goods_name,goods_price FROM tdb_goods WHERE goods_price>ALL

(SELECT goods_price FROM tdb_goods WHERE goodscate='超级本');

+----------+----------------------------------+-------------+

| goods_id | goods_name                       | goods_price |

+----------+----------------------------------+-------------+

|        3 | G150TH 15.6英寸游戏本            |    8499.000 |

|       13 | iMac ME086CH/A 21.5英寸一体电脑  |    9188.000 |

|       17 | Mac Pro MD878CH/A 专业级台式 脑 |   28888.000 |

+----------+----------------------------------+-------------+

3 rows in set (0.01 sec)

 

mysql>  #使用 in 和not in 引发的子查询;

mysql> #EXIST 和not EXIST 引发的子查询

 

mysql>  #创建商品标签数据表:

mysql> CREATE TABLE IF NOT EXISTS tdb_goods_cate(

    -> cate_id SMALLINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,

    -> cate_name VARCHAR(40) NOT NULL

    -> );

Query OK, 0 rows affected (0.18 sec)

 

mysql> #得到商品分类;

mysql> SELECT goods_cate FROM tdb_goods GROUP BY goods_cate;

+---------------+

| goods_cate    |

+---------------+

| 台式机        |

| 平板电脑      |

| 服务器/工作站 |

| 游戏本        |

| 笔记本        |

| 笔记本配件    |

| 超级本        |

+---------------+

7 rows in set (0.00 sec)

 

mysql> #将查询的结果写入的数据表中、

mysql> SELECT * FROM tdb_goods_cate;

Empty set (0.00 sec)

 

mysql> DESC tdb_goods_cate;

+-----------+----------------------+------+-----+---------+----------------+

| Field     | Type                 | Null | Key | Default | Extra          |

+-----------+----------------------+------+-----+---------+----------------+

| cate_id   | smallint(5) unsigned | NO   | PRI | NULL    | auto_increment |

| cate_name | varchar(40)          | NO   |     | NULL    |                |

+-----------+----------------------+------+-----+---------+----------------+

2 rows in set (0.01 sec)

 

mysql> INSERT tdb_goods_cate(cate_name) SELECT goods_cate FROM tdb_goods GROUP BY goods_cate;

Query OK, 7 rows affected (0.04 sec)

Records: 7  Duplicates: 0  Warnings: 0

 

mysql> SELECT * FROM tdb_goods_cate;

+---------+---------------+

| cate_id | cate_name     |

+---------+---------------+

|       1 | 台式机        |

|       2 | 平板电脑      |

|       3 | 服务器/工作站 |

|       4 | 游戏本        |

|       5 | 笔记本        |

|       6 | 笔记本配件    |

|       7 | 超级本        |

+---------+---------------+

7 rows in set (0.00 sec)

 

mysql> #参照分类表更新商品表、

mysql> UPDATE tdb_goods INNER JOIN tdb_goods_cate ON goods_cate=cate_name SET goods_cate=cate_id;

Query OK, 22 rows affected (0.21 sec)

Rows matched: 22  Changed: 22  Warnings: 0

 

mysql> SELECT * FROM tdb_goods\G;

*************************** 1. row ***************************

   goods_id: 1

 goods_name: R510VC 15.6英寸笔记本

 goods_cate: 5

 brand_name: 华硕

goods_price: 3399.000

    is_show: 1

 is_saleoff: 0

*************************** 2. row ***************************

   goods_id: 2

 goods_name: Y400N 14.0英寸笔记本电脑

 goods_cate: 5

 brand_name: 联想

goods_price: 4899.000

    is_show: 1

 is_saleoff: 0

*************************** 3. row ***************************

   goods_id: 3

 goods_name: G150TH 15.6英寸游戏本

 goods_cate: 4

 brand_name: 雷神

goods_price: 8499.000

    is_show: 1

 is_saleoff: 0

*************************** 4. row ***************************

   goods_id: 4

 goods_name: X550CC 15.6英寸笔记本

 goods_cate: 5

 brand_name: 华硕

goods_price: 2799.000

    is_show: 1

 is_saleoff: 0

*************************** 5. row ***************************

   goods_id: 5

 goods_name: X240(20ALA0EYCD) 12.5英寸超极本

 goods_cate: 7

 brand_name: 联想

goods_price: 4999.000

    is_show: 1

 is_saleoff: 0

*************************** 6. row ***************************

   goods_id: 6

 goods_name: U330P 13.3英寸超极本

 goods_cate: 7

 brand_name: 联想

goods_price: 4299.000

    is_show: 1

 is_saleoff: 0

*************************** 7. row ***************************

   goods_id: 7

 goods_name: SVP13226SCB 13.3英寸触控超极本

 goods_cate: 7

 brand_name: 索尼

goods_price: 7999.000

    is_show: 1

 is_saleoff: 0

*************************** 8. row ***************************

   goods_id: 8

 goods_name: iPad mini MD531CH/A 7.9英寸平板电脑

 goods_cate: 2

 brand_name: 苹果

goods_price: 1998.000

    is_show: 1

 is_saleoff: 0

*************************** 9. row ***************************

   goods_id: 9

 goods_name: iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)

 goods_cate: 2

 brand_name: 苹果

goods_price: 3388.000

    is_show: 1

 is_saleoff: 0

*************************** 10. row ***************************

   goods_id: 10

 goods_name:  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版)

 goods_cate: 2

 brand_name: 苹果

goods_price: 2788.000

    is_show: 1

 is_saleoff: 0

*************************** 11. row ***************************

   goods_id: 11

 goods_name: IdeaCentre C340 20英寸一体电脑

 goods_cate: 1

 brand_name: 联想

goods_price: 3499.000

    is_show: 1

 is_saleoff: 0

*************************** 12. row ***************************

   goods_id: 12

 goods_name: Vostro 3800-R1206 台式电脑

 goods_cate: 1

 brand_name: 戴尔

goods_price: 2899.000

    is_show: 1

 is_saleoff: 0

*************************** 13. row ***************************

   goods_id: 13

 goods_name: iMac ME086CH/A 21.5英寸一体电脑

 goods_cate: 1

 brand_name: 苹果

goods_price: 9188.000

    is_show: 1

 is_saleoff: 0

*************************** 14. row ***************************

   goods_id: 14

 goods_name: AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )

 goods_cate: 1

 brand_name: 宏碁

goods_price: 3699.000

    is_show: 1

 is_saleoff: 0

*************************** 15. row ***************************

   goods_id: 15

 goods_name: Z220SFF F4F06PA工作站

 goods_cate: 3

 brand_name: 惠普

goods_price: 4288.000

    is_show: 1

 is_saleoff: 0

*************************** 16. row ***************************

   goods_id: 16

 goods_name: PowerEdge T110 II服务器

 goods_cate: 3

 brand_name: 戴尔

goods_price: 5388.000

    is_show: 1

 is_saleoff: 0

*************************** 17. row ***************************

   goods_id: 17

 goods_name: Mac Pro MD878CH/A 专业级台式电脑

 goods_cate: 3

 brand_name: 苹果

goods_price: 28888.000

    is_show: 1

 is_saleoff: 0

*************************** 18. row ***************************

   goods_id: 18

 goods_name:  HMZ-T3W 头戴显示设备

 goods_cate: 6

 brand_name: 索尼

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 19. row ***************************

   goods_id: 19

 goods_name: 商务双肩背包

 goods_cate: 6

 brand_name: 索尼

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

*************************** 20. row ***************************

   goods_id: 20

 goods_name: X3250 M4机架式服务器 2583i14

 goods_cate: 3

 brand_name: IBM

goods_price: 6888.000

    is_show: 1

 is_saleoff: 0

*************************** 21. row ***************************

   goods_id: 21

 goods_name:  HMZ-T3W 头戴显示设备

 goods_cate: 6

 brand_name: 索尼

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 22. row ***************************

   goods_id: 22

 goods_name: 商务双肩背包

 goods_cate: 6

 brand_name: 索尼

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

22 rows in set (0.00 sec)

 

ERROR:

No query specified

 

mysql> SELECT * FROM tdb_goods_brands;

+----------+------------+

| brand_id | brand_name |

+----------+------------+

|        1 | IBM        |

|        2 | 华硕       |

|        3 | 宏碁       |

|        4 | 惠普       |

|        5 | 戴尔       |

|        6 | 索尼       |

|        7 | 联想       |

|        8 | 苹果       |

|        9 | 雷神       |

+----------+------------+

9 rows in set (0.00 sec)

 

mysql> SHOW COLUMNS FROM tdb_goods;

+-------------+------------------------+------+-----+---------+----------------+

| Field       | Type                   | Null | Key | Default | Extra          |

+-------------+------------------------+------+-----+---------+----------------+

| goods_id    | smallint(5) unsigned   | NO   | PRI | NULL    | auto_increment |

| goods_name  | varchar(150)           | NO   |     | NULL    |                |

| goods_cate  | varchar(40)            | NO   |     | NULL    |                |

| brand_name  | varchar(40)            | NO   |     | NULL    |                |

| goods_price | decimal(15,3) unsigned | NO   |     | 0.000   |                |

| is_show     | tinyint(1)             | NO   |     | 1       |                |

| is_saleoff  | tinyint(1)             | NO   |     | 0       |                |

+-------------+------------------------+------+-----+---------+----------------+

7 rows in set (0.03 sec)

 

mysql> SHOW COLUMNS FROM tdb_goods_brands;

+------------+----------------------+------+-----+---------+----------------+

| Field      | Type                 | Null | Key | Default | Extra          |

+------------+----------------------+------+-----+---------+----------------+

| brand_id   | smallint(5) unsigned | NO   | PRI | NULL    | auto_increment |

| brand_name | varchar(40)          | NO   |     | NULL    |                |

+------------+----------------------+------+-----+---------+----------------+

2 rows in set (0.00 sec)

 

mysql> UPDATE tdb_goods AS g INNER JOIN tdb_goods_brands AS b ON g.brand_name=b.brand_name

    -> SET g.brand_name=b.brand_id;

Query OK, 22 rows affected (0.06 sec)

Rows matched: 22  Changed: 22  Warnings: 0

 

mysql> SELECT * FROM tdb_goods\G;

*************************** 1. row ***************************

   goods_id: 1

 goods_name: R510VC 15.6英寸笔记本

 goods_cate: 5

 brand_name: 2

goods_price: 3399.000

    is_show: 1

 is_saleoff: 0

*************************** 2. row ***************************

   goods_id: 2

 goods_name: Y400N 14.0英寸笔记本电脑

 goods_cate: 5

 brand_name: 7

goods_price: 4899.000

    is_show: 1

 is_saleoff: 0

*************************** 3. row ***************************

   goods_id: 3

 goods_name: G150TH 15.6英寸游戏本

 goods_cate: 4

 brand_name: 9

goods_price: 8499.000

    is_show: 1

 is_saleoff: 0

*************************** 4. row ***************************

   goods_id: 4

 goods_name: X550CC 15.6英寸笔记本

 goods_cate: 5

 brand_name: 2

goods_price: 2799.000

    is_show: 1

 is_saleoff: 0

*************************** 5. row ***************************

   goods_id: 5

 goods_name: X240(20ALA0EYCD) 12.5英寸超极本

 goods_cate: 7

 brand_name: 7

goods_price: 4999.000

    is_show: 1

 is_saleoff: 0

*************************** 6. row ***************************

   goods_id: 6

 goods_name: U330P 13.3英寸超极本

 goods_cate: 7

 brand_name: 7

goods_price: 4299.000

    is_show: 1

 is_saleoff: 0

*************************** 7. row ***************************

   goods_id: 7

 goods_name: SVP13226SCB 13.3英寸触控超极本

 goods_cate: 7

 brand_name: 6

goods_price: 7999.000

    is_show: 1

 is_saleoff: 0

*************************** 8. row ***************************

   goods_id: 8

 goods_name: iPad mini MD531CH/A 7.9英寸平板电脑

 goods_cate: 2

 brand_name: 8

goods_price: 1998.000

    is_show: 1

 is_saleoff: 0

*************************** 9. row ***************************

   goods_id: 9

 goods_name: iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)

 goods_cate: 2

 brand_name: 8

goods_price: 3388.000

    is_show: 1

 is_saleoff: 0

*************************** 10. row ***************************

   goods_id: 10

 goods_name:  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版)

 goods_cate: 2

 brand_name: 8

goods_price: 2788.000

    is_show: 1

 is_saleoff: 0

*************************** 11. row ***************************

   goods_id: 11

 goods_name: IdeaCentre C340 20英寸一体电脑

 goods_cate: 1

 brand_name: 7

goods_price: 3499.000

    is_show: 1

 is_saleoff: 0

*************************** 12. row ***************************

   goods_id: 12

 goods_name: Vostro 3800-R1206 台式电脑

 goods_cate: 1

 brand_name: 5

goods_price: 2899.000

    is_show: 1

 is_saleoff: 0

*************************** 13. row ***************************

   goods_id: 13

 goods_name: iMac ME086CH/A 21.5英寸一体电脑

 goods_cate: 1

 brand_name: 8

goods_price: 9188.000

    is_show: 1

 is_saleoff: 0

*************************** 14. row ***************************

   goods_id: 14

 goods_name: AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )

 goods_cate: 1

 brand_name: 3

goods_price: 3699.000

    is_show: 1

 is_saleoff: 0

*************************** 15. row ***************************

   goods_id: 15

 goods_name: Z220SFF F4F06PA工作站

 goods_cate: 3

 brand_name: 4

goods_price: 4288.000

    is_show: 1

 is_saleoff: 0

*************************** 16. row ***************************

   goods_id: 16

 goods_name: PowerEdge T110 II服务器

 goods_cate: 3

 brand_name: 5

goods_price: 5388.000

    is_show: 1

 is_saleoff: 0

*************************** 17. row ***************************

   goods_id: 17

 goods_name: Mac Pro MD878CH/A 专业级台式电脑

 goods_cate: 3

 brand_name: 8

goods_price: 28888.000

    is_show: 1

 is_saleoff: 0

*************************** 18. row ***************************

   goods_id: 18

 goods_name:  HMZ-T3W 头戴显示设备

 goods_cate: 6

 brand_name: 6

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 19. row ***************************

   goods_id: 19

 goods_name: 商务双肩背包

 goods_cate: 6

 brand_name: 6

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

*************************** 20. row ***************************

   goods_id: 20

 goods_name: X3250 M4机架式服务器 2583i14

 goods_cate: 3

 brand_name: 1

goods_price: 6888.000

    is_show: 1

 is_saleoff: 0

*************************** 21. row ***************************

   goods_id: 21

 goods_name:  HMZ-T3W 头戴显示设备

 goods_cate: 6

 brand_name: 6

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 22. row ***************************

   goods_id: 22

 goods_name: 商务双肩背包

 goods_cate: 6

 brand_name: 6

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

22 rows in set (0.00 sec)

 

ERROR:

No query specified

 

mysql> SHOW COLUMNS FROM tdb_goods;

+-------------+------------------------+------+-----+---------+----------------+

| Field       | Type                   | Null | Key | Default | Extra          |

+-------------+------------------------+------+-----+---------+----------------+

| goods_id    | smallint(5) unsigned   | NO   | PRI | NULL    | auto_increment |

| goods_name  | varchar(150)           | NO   |     | NULL    |                |

| goods_cate  | varchar(40)            | NO   |     | NULL    |                |

| brand_name  | varchar(40)            | NO   |     | NULL    |                |

| goods_price | decimal(15,3) unsigned | NO   |     | 0.000   |                |

| is_show     | tinyint(1)             | NO   |     | 1       |                |

| is_saleoff  | tinyint(1)             | NO   |     | 0       |                |

+-------------+------------------------+------+-----+---------+----------------+

7 rows in set (0.00 sec)

 

mysql> ALTER TABLE tdb_goods

    -> CHANGE goods_cate cate_id SMALLINT UNSIGNED NOT NULL,

    -> CHANGE brand_name brand_id SMALLINT UNSIGNED NOT NULL;

Query OK, 22 rows affected (0.67 sec)

Records: 22  Duplicates: 0  Warnings: 0

 

mysql> SHOW COLUMNS FROM tdb_goods;

+-------------+------------------------+------+-----+---------+----------------+

| Field       | Type                   | Null | Key | Default | Extra          |

+-------------+------------------------+------+-----+---------+----------------+

| goods_id    | smallint(5) unsigned   | NO   | PRI | NULL    | auto_increment |

| goods_name  | varchar(150)           | NO   |     | NULL    |                |

| cate_id     | smallint(5) unsigned   | NO   |     | NULL    |                |

| brand_id    | smallint(5) unsigned   | NO   |     | NULL    |                |

| goods_price | decimal(15,3) unsigned | NO   |     | 0.000   |                |

| is_show     | tinyint(1)             | NO   |     | 1       |                |

| is_saleoff  | tinyint(1)             | NO   |     | 0       |                |

+-------------+------------------------+------+-----+---------+----------------+

7 rows in set (0.00 sec)

 

mysql> #创建一个事实的外键;

mysql> SELECT * FROM tdb_goods\G;

*************************** 1. row ***************************

   goods_id: 1

 goods_name: R510VC 15.6英寸笔记本

    cate_id: 5

   brand_id: 2

goods_price: 3399.000

    is_show: 1

 is_saleoff: 0

*************************** 2. row ***************************

   goods_id: 2

 goods_name: Y400N 14.0英寸笔记本电脑

    cate_id: 5

   brand_id: 7

goods_price: 4899.000

    is_show: 1

 is_saleoff: 0

*************************** 3. row ***************************

   goods_id: 3

 goods_name: G150TH 15.6英寸游戏本

    cate_id: 4

   brand_id: 9

goods_price: 8499.000

    is_show: 1

 is_saleoff: 0

*************************** 4. row ***************************

   goods_id: 4

 goods_name: X550CC 15.6英寸笔记本

    cate_id: 5

   brand_id: 2

goods_price: 2799.000

    is_show: 1

 is_saleoff: 0

*************************** 5. row ***************************

   goods_id: 5

 goods_name: X240(20ALA0EYCD) 12.5英寸超极本

    cate_id: 7

   brand_id: 7

goods_price: 4999.000

    is_show: 1

 is_saleoff: 0

*************************** 6. row ***************************

   goods_id: 6

 goods_name: U330P 13.3英寸超极本

    cate_id: 7

   brand_id: 7

goods_price: 4299.000

    is_show: 1

 is_saleoff: 0

*************************** 7. row ***************************

   goods_id: 7

 goods_name: SVP13226SCB 13.3英寸触控超极本

    cate_id: 7

   brand_id: 6

goods_price: 7999.000

    is_show: 1

 is_saleoff: 0

*************************** 8. row ***************************

   goods_id: 8

 goods_name: iPad mini MD531CH/A 7.9英寸平板电脑

    cate_id: 2

   brand_id: 8

goods_price: 1998.000

    is_show: 1

 is_saleoff: 0

*************************** 9. row ***************************

   goods_id: 9

 goods_name: iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)

    cate_id: 2

   brand_id: 8

goods_price: 3388.000

    is_show: 1

 is_saleoff: 0

*************************** 10. row ***************************

   goods_id: 10

 goods_name:  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版)

    cate_id: 2

   brand_id: 8

goods_price: 2788.000

    is_show: 1

 is_saleoff: 0

*************************** 11. row ***************************

   goods_id: 11

 goods_name: IdeaCentre C340 20英寸一体电脑

    cate_id: 1

   brand_id: 7

goods_price: 3499.000

    is_show: 1

 is_saleoff: 0

*************************** 12. row ***************************

   goods_id: 12

 goods_name: Vostro 3800-R1206 台式电脑

    cate_id: 1

   brand_id: 5

goods_price: 2899.000

    is_show: 1

 is_saleoff: 0

*************************** 13. row ***************************

   goods_id: 13

 goods_name: iMac ME086CH/A 21.5英寸一体电脑

    cate_id: 1

   brand_id: 8

goods_price: 9188.000

    is_show: 1

 is_saleoff: 0

*************************** 14. row ***************************

   goods_id: 14

 goods_name: AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )

    cate_id: 1

   brand_id: 3

goods_price: 3699.000

    is_show: 1

 is_saleoff: 0

*************************** 15. row ***************************

   goods_id: 15

 goods_name: Z220SFF F4F06PA工作站

    cate_id: 3

   brand_id: 4

goods_price: 4288.000

    is_show: 1

 is_saleoff: 0

*************************** 16. row ***************************

   goods_id: 16

 goods_name: PowerEdge T110 II服务器

    cate_id: 3

   brand_id: 5

goods_price: 5388.000

    is_show: 1

 is_saleoff: 0

*************************** 17. row ***************************

   goods_id: 17

 goods_name: Mac Pro MD878CH/A 专业级台式电脑

    cate_id: 3

   brand_id: 8

goods_price: 28888.000

    is_show: 1

 is_saleoff: 0

*************************** 18. row ***************************

   goods_id: 18

 goods_name:  HMZ-T3W 头戴显示设备

    cate_id: 6

   brand_id: 6

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 19. row ***************************

   goods_id: 19

 goods_name: 商务双肩背包

    cate_id: 6

   brand_id: 6

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

*************************** 20. row ***************************

   goods_id: 20

 goods_name: X3250 M4机架式服务器 2583i14

    cate_id: 3

   brand_id: 1

goods_price: 6888.000

    is_show: 1

 is_saleoff: 0

*************************** 21. row ***************************

   goods_id: 21

 goods_name:  HMZ-T3W 头戴显示设备

    cate_id: 6

   brand_id: 6

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 22. row ***************************

   goods_id: 22

 goods_name: 商务双肩背包

    cate_id: 6

   brand_id: 6

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

22 rows in set (0.00 sec)

 

ERROR:

No query specified

 

mysql> INSERT tdb_goods_cates(cate_name) VALUES('路由器'),('交换机'),('网卡');

ERROR 1146 (42S02): Table 'world.tdb_goods_cates' doesn't exist

mysql>

mysql>    INSERT tdb_goods_brands(brand_name) VALUES('海尔'),('清华同方'),('神舟');

Query OK, 3 rows affected (0.07 sec)

Records: 3  Duplicates: 0  Warnings: 0

 

mysql> #在tdb_goods数据表写入任意记录

mysql> INSERT tdb_goods(goods_name,cate_id,brand_id,goods_price)

VALUES(' LaserJet Pro P1606dn 黑白激光打印机','12','4','1849');

Query OK, 1 row affected (0.08 sec)

 

mysql> SELECT * FROM tdb_goods_cate;

+---------+---------------+

| cate_id | cate_name     |

+---------+---------------+

|       1 | 台式机        |

|       2 | 平板电脑      |

|       3 | 服务器/工作站 |

|       4 | 游戏本        |

|       5 | 笔记本        |

|       6 | 笔记本配件    |

|       7 | 超级本        |

+---------+---------------+

7 rows in set (0.03 sec)

 

mysql> SELECT * FROM tdb_goods\G;

*************************** 1. row ***************************

   goods_id: 1

 goods_name: R510VC 15.6英寸笔记本

    cate_id: 5

   brand_id: 2

goods_price: 3399.000

    is_show: 1

 is_saleoff: 0

*************************** 2. row ***************************

   goods_id: 2

 goods_name: Y400N 14.0英寸笔记本电脑

    cate_id: 5

   brand_id: 7

goods_price: 4899.000

    is_show: 1

 is_saleoff: 0

*************************** 3. row ***************************

   goods_id: 3

 goods_name: G150TH 15.6英寸游戏本

    cate_id: 4

   brand_id: 9

goods_price: 8499.000

    is_show: 1

 is_saleoff: 0

*************************** 4. row ***************************

   goods_id: 4

 goods_name: X550CC 15.6英寸笔记本

    cate_id: 5

   brand_id: 2

goods_price: 2799.000

    is_show: 1

 is_saleoff: 0

*************************** 5. row ***************************

   goods_id: 5

 goods_name: X240(20ALA0EYCD) 12.5英寸超极本

    cate_id: 7

   brand_id: 7

goods_price: 4999.000

    is_show: 1

 is_saleoff: 0

*************************** 6. row ***************************

   goods_id: 6

 goods_name: U330P 13.3英寸超极本

    cate_id: 7

   brand_id: 7

goods_price: 4299.000

    is_show: 1

 is_saleoff: 0

*************************** 7. row ***************************

   goods_id: 7

 goods_name: SVP13226SCB 13.3英寸触控超极本

    cate_id: 7

   brand_id: 6

goods_price: 7999.000

    is_show: 1

 is_saleoff: 0

*************************** 8. row ***************************

   goods_id: 8

 goods_name: iPad mini MD531CH/A 7.9英寸平板电脑

    cate_id: 2

   brand_id: 8

goods_price: 1998.000

    is_show: 1

 is_saleoff: 0

*************************** 9. row ***************************

   goods_id: 9

 goods_name: iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)

    cate_id: 2

   brand_id: 8

goods_price: 3388.000

    is_show: 1

 is_saleoff: 0

*************************** 10. row ***************************

   goods_id: 10

 goods_name:  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版)

    cate_id: 2

   brand_id: 8

goods_price: 2788.000

    is_show: 1

 is_saleoff: 0

*************************** 11. row ***************************

   goods_id: 11

 goods_name: IdeaCentre C340 20英寸一体电脑

    cate_id: 1

   brand_id: 7

goods_price: 3499.000

    is_show: 1

 is_saleoff: 0

*************************** 12. row ***************************

   goods_id: 12

 goods_name: Vostro 3800-R1206 台式电脑

    cate_id: 1

   brand_id: 5

goods_price: 2899.000

    is_show: 1

 is_saleoff: 0

*************************** 13. row ***************************

   goods_id: 13

 goods_name: iMac ME086CH/A 21.5英寸一体电脑

    cate_id: 1

   brand_id: 8

goods_price: 9188.000

    is_show: 1

 is_saleoff: 0

*************************** 14. row ***************************

   goods_id: 14

 goods_name: AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )

    cate_id: 1

   brand_id: 3

goods_price: 3699.000

    is_show: 1

 is_saleoff: 0

*************************** 15. row ***************************

   goods_id: 15

 goods_name: Z220SFF F4F06PA工作站

    cate_id: 3

   brand_id: 4

goods_price: 4288.000

    is_show: 1

 is_saleoff: 0

*************************** 16. row ***************************

   goods_id: 16

 goods_name: PowerEdge T110 II服务器

    cate_id: 3

   brand_id: 5

goods_price: 5388.000

    is_show: 1

 is_saleoff: 0

*************************** 17. row ***************************

   goods_id: 17

 goods_name: Mac Pro MD878CH/A 专业级台式电脑

    cate_id: 3

   brand_id: 8

goods_price: 28888.000

    is_show: 1

 is_saleoff: 0

*************************** 18. row ***************************

   goods_id: 18

 goods_name:  HMZ-T3W 头戴显示设备

    cate_id: 6

   brand_id: 6

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 19. row ***************************

   goods_id: 19

 goods_name: 商务双肩背包

    cate_id: 6

   brand_id: 6

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

*************************** 20. row ***************************

   goods_id: 20

 goods_name: X3250 M4机架式服务器 2583i14

    cate_id: 3

   brand_id: 1

goods_price: 6888.000

    is_show: 1

 is_saleoff: 0

*************************** 21. row ***************************

   goods_id: 21

 goods_name:  HMZ-T3W 头戴显示设备

    cate_id: 6

   brand_id: 6

goods_price: 6999.000

    is_show: 1

 is_saleoff: 0

*************************** 22. row ***************************

   goods_id: 22

 goods_name: 商务双肩背包

    cate_id: 6

   brand_id: 6

goods_price: 99.000

    is_show: 1

 is_saleoff: 0

*************************** 23. row ***************************

   goods_id: 23

 goods_name:  LaserJet Pro P1606dn 黑白激光打印机

    cate_id: 12

   brand_id: 4

goods_price: 1849.000

    is_show: 1

 is_saleoff: 0

23 rows in set (0.00 sec)

 

ERROR:

No query specified

 

mysql> #数据表参照,用别名;

mysql> #内链接 ,取交集;

mysql> SHOW COLUMNS FROM tdb_goods;

+-------------+------------------------+------+-----+---------+----------------+

| Field       | Type                   | Null | Key | Default | Extra   |

+-------------+------------------------+------+-----+---------+----------------+

| goods_id    | smallint(5) unsigned   | NO   | PRI | NULL    | auto_increment |

| goods_name  | varchar(150)           | NO   |     | NULL    |       |

| cate_id     | smallint(5) unsigned   | NO   |     | NULL    |           |

| brand_id    | smallint(5) unsigned   | NO   |     | NULL    |           |

| goods_price | decimal(15,3) unsigned | NO   |     | 0.000   |              |

| is_show     | tinyint(1)             | NO   |     | 1       |     |

| is_saleoff  | tinyint(1)             | NO   |     | 0       |      |

+-------------+------------------------+------+-----+---------+----------------+

7 rows in set (0.00 sec)

 

mysql> SHOW COLUMNS FROM tdb_goods_cate;

+-----------+----------------------+------+-----+---------+----------------+

| Field     | Type                 | Null | Key | Default | Extra       |

+-----------+----------------------+------+-----+---------+----------------+

| cate_id   | smallint(5) unsigned | NO   | PRI | NULL    | auto_increment |

| cate_name | varchar(40)          | NO   |     | NULL    |            |

+-----------+----------------------+------+-----+---------+----------------+

2 rows in set (0.00 sec)

 

mysql> SELECT goods_id,goods_name,cate_name

    -> FROM tdb_goods INNER JOIN tdb_goods_cate

    -> ON tdb_goods.cate_id=tdb_goods_cate.cate_id;

+----------+------------------------------------------------------------------------+---------------+

| goods_id | goods_name                               | cate_name     |

+----------+------------------------------------------------------------------------+---------------+

|        1 | R510VC 15.6英寸笔记本                    | 笔记本        |

|        2 | Y400N 14.0英寸笔记本电脑                | 笔记本        |

|        3 | G150TH 15.6英寸游戏本                 | 游戏本        |

|        4 | X550CC 15.6英寸笔记本                   | 笔记本        |

|        5 | X240(20ALA0EYCD) 12.5英寸超极本               | 超级本        |

|        6 | U330P 13.3英寸超极本                     | 超级本        |

|        7 | SVP13226SCB 13.3英寸触控超极本                                         | 超级本        |

|        8 | iPad mini MD531CH/A 7.9英寸平板电脑                                    | 平板电脑      |

|        9 | iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)                      | 平板电脑      |

|       10 |  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版) | 平板电脑      |

|       11 | IdeaCentre C340 20英寸一体电脑                                         | 台式机        |

|       12 | Vostro 3800-R1206 台式电脑                                             | 台式机        |

|       13 | iMac ME086CH/A 21.5英寸一体电脑                                        | 台式机        |

|       14 | AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )     | 台式机        |

|       15 | Z220SFF F4F06PA工作站                                                  | 服务器/工作站 |

|       16 | PowerEdge T110 II服务器                                                | 服务器/工作站 |

|       17 | Mac Pro MD878CH/A 专业级台式电脑                                       | 服务器/工作站 |

|       18 |  HMZ-T3W 头戴显示设备                                                  | 笔记本配件    |

|       19 | 商务双肩背包                                                           | 笔记本配件    |

|       20 | X3250 M4机架式服务器 2583i14                                           | 服务器/工作站 |

|       21 |  HMZ-T3W 头戴显示设备                                                  | 笔记本配件    |

|       22 | 商务双肩背包                                                           | 笔记本配件    |

+----------+------------------------------------------------------------------------+---------------+

22 rows in set (0.01 sec)

 

mysql> SELECT * FROM tdb_goods_cate;

+---------+---------------+

| cate_id | cate_name     |

+---------+---------------+

|       1 | 台式机        |

|       2 | 平板电脑      |

|       3 | 服务器/工作站 |

|       4 | 游戏本        |

|       5 | 笔记本        |

|       6 | 笔记本配件    |

|       7 | 超级本        |

+---------+---------------+

7 rows in set (0.00 sec)

 

mysql> #左外连接,取左表中的全部和右表符合条件的部分;

mysql> SELECT goods_id,goods_name,cate_name

    -> FROM tdb_goods LEFT JOIN tdb_goods_cate

    -> ON tdb_goods.cate_id=tdb_goods_cate.cate_id;

+----------+------------------------------------------------------------------------+---------------+

| goods_id | goods_name                                           | cate_name     |

+----------+------------------------------------------------------------------------+---------------+

|        1 | R510VC 15.6英寸笔记本                                 | 笔记本        |

|        2 | Y400N 14.0英寸笔记本电脑                                | 笔记本        |

|        3 | G150TH 15.6英寸游戏本                                 | 游戏本        |

|        4 | X550CC 15.6英寸笔记本                                 | 笔记本        |

|        5 | X240(20ALA0EYCD) 12.5英寸超极本                          | 超级本        |

|        6 | U330P 13.3英寸超极本                                 | 超级本        |

|        7 | SVP13226SCB 13.3英寸触控超极本                           | 超级本        |

|        8 | iPad mini MD531CH/A 7.9英寸平板电脑                        | 平板电脑      |

|        9 | iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)                | 平板电脑      |

|       10 |  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版) | 平板电脑      |

|       11 | IdeaCentre C340 20英寸一体电脑                            | 台式机        |

|       12 | Vostro 3800-R1206 台式电脑                               | 台式机        |

|       13 | iMac ME086CH/A 21.5英寸一体电脑                          | 台式机        |

|       14 | AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )     | 台式机        |

|       15 | Z220SFF F4F06PA工作站                                | 服务器/工作站 |

|       16 | PowerEdge T110 II服务器                               | 服务器/工作站 |

|       17 | Mac Pro MD878CH/A 专业级台式电脑                          | 服务器/工作站 |

|       18 |  HMZ-T3W 头戴显示设备                               | 笔记本配件    |

|       19 | 商务双肩背包                                         | 笔记本配件    |

|       20 | X3250 M4机架式服务器 2583i14                              | 服务器/工作站 |

|       21 |  HMZ-T3W 头戴显示设备                                  | 笔记本配件    |

|       22 | 商务双肩背包                                         | 笔记本配件    |

|       23 |  LaserJet Pro P1606dn 黑白激光打印机                       | NULL          |

+----------+------------------------------------------------------------------------+---------------+

23 rows in set (0.00 sec)

 

mysql> #右外连接,取右表中的全部和左表符合条件的部分;

mysql> SELECT goods_id,goods_name,cate_name

    -> FROM tdb_goods RIGHT JOIN tdb_goods_cate

    -> ON tdb_goods.cate_id=tdb_goods_cate.cate_id;

+----------+------------------------------------------------------------------------+---------------+

| goods_id | goods_name                                             | cate_name     |

+----------+------------------------------------------------------------------------+---------------+

|        1 | R510VC 15.6英寸笔记本                                | 笔记本        |

|        2 | Y400N 14.0英寸笔记本电脑                                               | 笔记本        |

|        3 | G150TH 15.6英寸游戏本                                                  | 游戏本        |

|        4 | X550CC 15.6英寸笔记本                                                  | 笔记本        |

|        5 | X240(20ALA0EYCD) 12.5英寸超极本                                        | 超级本        |

|        6 | U330P 13.3英寸超极本                                                   | 超级本        |

|        7 | SVP13226SCB 13.3英寸触控超极本                                         | 超级本        |

|        8 | iPad mini MD531CH/A 7.9英寸平板电脑                                    | 平板电脑      |

|        9 | iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)                      | 平板电脑      |

|       10 |  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版) | 平板电脑      |

|       11 | IdeaCentre C340 20英寸一体电脑                                         | 台式机        |

|       12 | Vostro 3800-R1206 台式电脑                                             | 台式机        |

|       13 | iMac ME086CH/A 21.5英寸一体电脑                                        | 台式机        |

|       14 | AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )     | 台式机        |

|       15 | Z220SFF F4F06PA工作站                                                  | 服务器/工作站 |

|       16 | PowerEdge T110 II服务器                                                | 服务器/工作站 |

|       17 | Mac Pro MD878CH/A 专业级台式电脑                                       | 服务器/工作站 |

|       18 |  HMZ-T3W 头戴显示设备                                                  | 笔记本配件    |

|       19 | 商务双肩背包                                                           | 笔记本配件    |

|       20 | X3250 M4机架式服务器 2583i14                                           | 服务器/工作站 |

|       21 |  HMZ-T3W 头戴显示设备                                                  | 笔记本配件    |

|       22 | 商务双肩背包                                                           | 笔记本配件    |

+----------+------------------------------------------------------------------------+---------------+

22 rows in set (0.02 sec)

 

mysql> SELECT goods_id,goods_name,cate_name

    -> FROM tdb_goods LEFT JOIN tdb_goods_cate

    -> ON tdb_goods.cate_id=tdb_goods_cate.cate_id\G;

*************************** 1. row ***************************

  goods_id: 1

goods_name: R510VC 15.6英寸笔记本

 cate_name: 笔记本

*************************** 2. row ***************************

  goods_id: 2

goods_name: Y400N 14.0英寸笔记本电脑

 cate_name: 笔记本

*************************** 3. row ***************************

  goods_id: 3

goods_name: G150TH 15.6英寸游戏本

 cate_name: 游戏本

*************************** 4. row ***************************

  goods_id: 4

goods_name: X550CC 15.6英寸笔记本

 cate_name: 笔记本

*************************** 5. row ***************************

  goods_id: 5

goods_name: X240(20ALA0EYCD) 12.5英寸超极本

 cate_name: 超级本

*************************** 6. row ***************************

  goods_id: 6

goods_name: U330P 13.3英寸超极本

 cate_name: 超级本

*************************** 7. row ***************************

  goods_id: 7

goods_name: SVP13226SCB 13.3英寸触控超极本

 cate_name: 超级本

*************************** 8. row ***************************

  goods_id: 8

goods_name: iPad mini MD531CH/A 7.9英寸平板电脑

 cate_name: 平板电脑

*************************** 9. row ***************************

  goods_id: 9

goods_name: iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)

 cate_name: 平板电脑

*************************** 10. row ***************************

  goods_id: 10

goods_name:  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版)

 cate_name: 平板电脑

*************************** 11. row ***************************

  goods_id: 11

goods_name: IdeaCentre C340 20英寸一体电脑

 cate_name: 台式机

*************************** 12. row ***************************

  goods_id: 12

goods_name: Vostro 3800-R1206 台式电脑

 cate_name: 台式机

*************************** 13. row ***************************

  goods_id: 13

goods_name: iMac ME086CH/A 21.5英寸一体电脑

 cate_name: 台式机

*************************** 14. row ***************************

  goods_id: 14

goods_name: AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )

 cate_name: 台式机

*************************** 15. row ***************************

  goods_id: 15

goods_name: Z220SFF F4F06PA工作站

 cate_name: 服务器/工作站

*************************** 16. row ***************************

  goods_id: 16

goods_name: PowerEdge T110 II服务器

 cate_name: 服务器/工作站

*************************** 17. row ***************************

  goods_id: 17

goods_name: Mac Pro MD878CH/A 专业级台式电脑

 cate_name: 服务器/工作站

*************************** 18. row ***************************

  goods_id: 18

goods_name:  HMZ-T3W 头戴显示设备

 cate_name: 笔记本配件

*************************** 19. row ***************************

  goods_id: 19

goods_name: 商务双肩背包

 cate_name: 笔记本配件

*************************** 20. row ***************************

  goods_id: 20

goods_name: X3250 M4机架式服务器 2583i14

 cate_name: 服务器/工作站

*************************** 21. row ***************************

  goods_id: 21

goods_name:  HMZ-T3W 头戴显示设备

 cate_name: 笔记本配件

*************************** 22. row ***************************

  goods_id: 22

goods_name: 商务双肩背包

 cate_name: 笔记本配件

*************************** 23. row ***************************

  goods_id: 23

goods_name:  LaserJet Pro P1606dn 黑白激光打印机

 cate_name: NULL

23 rows in set (0.00 sec)

 

ERROR:

No query specified

 

mysql> #多表连接;

mysql> SHOW COLUMNS FROM tdb_goods\G;

*************************** 1. row ***************************

  Field: goods_id

   Type: smallint(5) unsigned

   Null: NO

    Key: PRI

Default: NULL

  Extra: auto_increment

*************************** 2. row ***************************

  Field: goods_name

   Type: varchar(150)

   Null: NO

    Key:

Default: NULL

  Extra:

*************************** 3. row ***************************

  Field: cate_id

   Type: smallint(5) unsigned

   Null: NO

    Key:

Default: NULL

  Extra:

*************************** 4. row ***************************

  Field: brand_id

   Type: smallint(5) unsigned

   Null: NO

    Key:

Default: NULL

  Extra:

*************************** 5. row ***************************

  Field: goods_price

   Type: decimal(15,3) unsigned

   Null: NO

    Key:

Default: 0.000

  Extra:

*************************** 6. row ***************************

  Field: is_show

   Type: tinyint(1)

   Null: NO

    Key:

Default: 1

  Extra:

*************************** 7. row ***************************

  Field: is_saleoff

   Type: tinyint(1)

   Null: NO

    Key:

Default: 0

  Extra:

7 rows in set (0.00 sec)

 

ERROR:

No query specified

 

mysql> #实现三张表的连接;

 

mysql> SELECT goods_id,goods_name,cate_name,brand_name,goods_price FROM tdb_goods AS g

    -> INNER JOIN tdb_goods_cate AS c

    -> ON g.cate_id=c.cate_id

    -> INNER JOIN tdb_goods_brands AS b

    -> ON g.brand_id=b.brand_id\G;

*************************** 1. row ***************************

   goods_id: 1

 goods_name: R510VC 15.6英寸笔记本

  cate_name: 笔记本

 brand_name: 华硕

goods_price: 3399.000

*************************** 2. row ***************************

   goods_id: 2

 goods_name: Y400N 14.0英寸笔记本电脑

  cate_name: 笔记本

 brand_name: 联想

goods_price: 4899.000

*************************** 3. row ***************************

   goods_id: 3

 goods_name: G150TH 15.6英寸游戏本

  cate_name: 游戏本

 brand_name: 雷神

goods_price: 8499.000

*************************** 4. row ***************************

   goods_id: 4

 goods_name: X550CC 15.6英寸笔记本

  cate_name: 笔记本

 brand_name: 华硕

goods_price: 2799.000

*************************** 5. row ***************************

   goods_id: 5

 goods_name: X240(20ALA0EYCD) 12.5英寸超极本

  cate_name: 超级本

 brand_name: 联想

goods_price: 4999.000

*************************** 6. row ***************************

   goods_id: 6

 goods_name: U330P 13.3英寸超极本

  cate_name: 超级本

 brand_name: 联想

goods_price: 4299.000

*************************** 7. row ***************************

   goods_id: 7

 goods_name: SVP13226SCB 13.3英寸触控超极本

  cate_name: 超级本

 brand_name: 索尼

goods_price: 7999.000

*************************** 8. row ***************************

   goods_id: 8

 goods_name: iPad mini MD531CH/A 7.9英寸平板电脑

  cate_name: 平板电脑

 brand_name: 苹果

goods_price: 1998.000

*************************** 9. row ***************************

   goods_id: 9

 goods_name: iPad Air MD788CH/A 9.7英寸平板电脑 (16G WiFi版)

  cate_name: 平板电脑

 brand_name: 苹果

goods_price: 3388.000

*************************** 10. row ***************************

   goods_id: 10

 goods_name:  iPad mini ME279CH/A 配备 Retina 显示屏 7.9英寸平板电脑 (16G WiFi版)

  cate_name: 平板电脑

 brand_name: 苹果

goods_price: 2788.000

*************************** 11. row ***************************

   goods_id: 11

 goods_name: IdeaCentre C340 20英寸一体电脑

  cate_name: 台式机

 brand_name: 联想

goods_price: 3499.000

*************************** 12. row ***************************

   goods_id: 12

 goods_name: Vostro 3800-R1206 台式电脑

  cate_name: 台式机

 brand_name: 戴尔

goods_price: 2899.000

*************************** 13. row ***************************

   goods_id: 13

 goods_name: iMac ME086CH/A 21.5英寸一体电脑

  cate_name: 台式机

 brand_name: 苹果

goods_price: 9188.000

*************************** 14. row ***************************

   goods_id: 14

 goods_name: AT7-7414LP 台式电脑 (i5-3450四核 4G 500G 2G独显 DVD 键鼠 Linux )

  cate_name: 台式机

 brand_name: 宏碁

goods_price: 3699.000

*************************** 15. row ***************************

   goods_id: 15

 goods_name: Z220SFF F4F06PA工作站

  cate_name: 服务器/工作站

 brand_name: 惠普

goods_price: 4288.000

*************************** 16. row ***************************

   goods_id: 16

 goods_name: PowerEdge T110 II服务器

  cate_name: 服务器/工作站

 brand_name: 戴尔

goods_price: 5388.000

*************************** 17. row ***************************

   goods_id: 17

 goods_name: Mac Pro MD878CH/A 专业级台式电脑

  cate_name: 服务器/工作站

 brand_name: 苹果

goods_price: 28888.000

*************************** 18. row ***************************

   goods_id: 18

 goods_name:  HMZ-T3W 头戴显示设备

  cate_name: 笔记本配件

 brand_name: 索尼

goods_price: 6999.000

*************************** 19. row ***************************

   goods_id: 19

 goods_name: 商务双肩背包

  cate_name: 笔记本配件

 brand_name: 索尼

goods_price: 99.000

*************************** 20. row ***************************

   goods_id: 20

 goods_name: X3250 M4机架式服务器 2583i14

  cate_name: 服务器/工作站

 brand_name: IBM

goods_price: 6888.000

*************************** 21. row ***************************

   goods_id: 21

 goods_name:  HMZ-T3W 头戴显示设备

  cate_name: 笔记本配件

 brand_name: 索尼

goods_price: 6999.000

*************************** 22. row ***************************

   goods_id: 22

 goods_name: 商务双肩背包

  cate_name: 笔记本配件

 brand_name: 索尼

goods_price: 99.000

22 rows in set (0.02 sec)

 

ERROR:

No query specified

 

mysql>

mysql> #SHOW COLUMNS FROM tdb_goods_cate;

mysql> SHOW COLUMNS FROM tdb_goods_cate;

+-----------+----------------------+------+-----+---------+----------------+

| Field     | Type                 | Null | Key | Default | Extra          |

+-----------+----------------------+------+-----+---------+----------------+

| cate_id   | smallint(5) unsigned | NO   | PRI | NULL    | auto_increment |

| cate_name | varchar(40)          | NO   |     | NULL    |                |

+-----------+----------------------+------+-----+---------+----------------+

2 rows in set (0.00 sec)

 

mysql> SELECT * FROM tdb_goods_cate;

+---------+---------------+

| cate_id | cate_name     |

+---------+---------------+

|       1 | 台式机        |

|       2 | 平板电脑      |

|       3 | 服务器/工作站 |

|       4 | 游戏本        |

|       5 | 笔记本        |

|       6 | 笔记本配件    |

|       7 | 超级本        |

+---------+---------------+

7 rows in set (0.00 sec)

 

mysql> CREATE TABLE tdb_goods_types(

    ->      type_id   SMALLINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,

    ->      type_name VARCHAR(20) NOT NULL,

    ->      parent_id SMALLINT UNSIGNED NOT NULL DEFAULT 0

    ->   );

Query OK, 0 rows affected (0.19 sec)

 

mysql> INSERT tdb_goods_types(type_name,parent_id) VALUES('家用电器',DEFAULT);

Query OK, 1 row affected (0.05 sec)

 

mysql>   INSERT tdb_goods_types(type_name,parent_id) VALUES('电脑、办公',DEFAULT);

Query OK, 1 row affected (0.02 sec)

 

mysql>   INSERT tdb_goods_types(type_name,parent_id) VALUES('大家电',1);

Query OK, 1 row affected (0.06 sec)

 

mysql>   INSERT tdb_goods_types(type_name,parent_id) VALUES('生活电器',1);

Query OK, 1 row affected (0.05 sec)

 

mysql>   INSERT tdb_goods_types(type_name,parent_id) VALUES('平板电视',3);

Query OK, 1 row affected (0.02 sec)

 

mysql>   INSERT tdb_goods_types(type_name,parent_id) VALUES('空调',3);

Query OK, 1 row affected (0.02 sec)

 

mysql>   INSERT tdb_goods_types(type_name,parent_id) VALUES('电风扇',4);

Query OK, 1 row affected (0.02 sec)

 

mysql>   INSERT tdb_goods_types(ty

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以上就是MySQL基础五:子查询与链接_MySQL的内容,更多相关内容请关注PHP中文网(www.php.cn)!


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