mysql如何查詢表字所有欄位？

mysql查詢表字所有欄位的方法：使用“SHOW FROM”語句來配合FULL關鍵字來查詢，語法“SHOW FULL COLUMNS FROM table_name”，可以顯示指定資料表的所有欄位資訊。

mysql查詢表字所有欄位

1、檢視所有表名：

show tables [from db_name];

2、查看欄位資訊

SHOW FULL COLUMNS FROM table_name

取得下列資訊
Field ：欄位名稱
Type：欄位類型
Collat​​ion：字元集（mysql 5.0以上有)
Null ：是否可以為NULL
Key：索引（PRI,unique,index)
Default：預設值
Extra：額外（是否auto_increment)
Privileges：權限
# Comment：備註（mysql 5.0以上有)

mysql> create table teacher  # 创建teacher表
    -> (
    -> Id int (5) auto_increment not null primary key,
    -> name char(10) not null,
    -> address varchar(50) default 'No.1 Mid school',
    -> year date
    -> );
Query OK, 0 rows affected (0.02 sec)

mysql> show tables;
+------------------+
| Tables_in_school |
+------------------+
| teacher          |
+------------------+
1 row in set (0.00 sec)

mysql> show full columns from teacher;  # 显示teacher表的所有字段
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
| Field   | Type        | Collation         | Null | Key | Default         | Extra          | Privileges                      | Comment |
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
| Id      | int(5)      | NULL              | NO   | PRI | NULL            | auto_increment | select,insert,update,references |         |
| name    | char(10)    | latin1_swedish_ci | NO   |     | NULL            |                | select,insert,update,references |         |
| address | varchar(50) | latin1_swedish_ci | YES  |     | No.1 Mid school |                | select,insert,update,references |         |
| year    | date        | NULL              | YES  |     | NULL            |                | select,insert,update,references |         |
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
4 rows in set (0.01 sec)

mysql> drop table teacher;  # 删除teacher表
Query OK, 0 rows affected (0.03 sec)

mysql> show tables;
Empty set (0.00 sec)

mysql>

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