sql delete语句及同时删除多表数据实现方法

sql delete语句及同时删除多表数据实现方法
delete
    [ from ]
        { table_name with ( [ ...n ] )
         | view_name
         | rowset_function_limited
        }

        [ from { } [ ,...n ] ]

    [ where
        {
        | { [ current of
                { { [ global ] cursor_name }
                    | cursor_variable_name
                }
            ] }
        }
    ]

from

是可选的关键字，可用在 delete 关键字与目标 table_name、view_name 或 rowset_function_limited 之间。

table_name

是要从其中删除行的表的名称。

在其作用域内的 table 变量、或是将 opendatasource 函数作为服务器名称的由四部分组成的表名（或视图名称）还可以在 delete 语句中作为表源使用。

with ( [...n])

指定目标表所允许的一个或多个表提示。需要有 with 关键字和圆括号。不允许有 readpast、nolock 和 readuncommitted。有关表提示的更多信息

多表关系sql删除语句

> create table employee(
    ->     id            int,
    ->     first_name    varchar(15),
    ->     last_name     varchar(15),
    ->     start_date    date,
    ->     end_date      date,
    ->     salary        float(8,2),
    ->     city          varchar(10),
    ->     description   varchar(15)
    -> );
query ok, 0 rows affected (0.02 sec)

mysql>
mysql> create table job (
    ->   id         int,
    ->   title      varchar(20)
    -> );
query ok, 0 rows affected (0.05 sec)

mysql>
mysql> insert into employee(id,first_name, last_name, start_date, end_date,   salary,  city,       description)
    ->              values (1,'jason',    'martin',  '19960725',  '20060725', 1234.56, 'toronto',  'programmer');
query ok, 1 row affected (0.00 sec)

mysql>
mysql> insert into employee(id,first_name, last_name, start_date, end_date,   salary,  city,       description)
    ->               values(2,'alison',   'mathews',  '19760321', '19860221', 6661.78, 'vancouver','tester');
query ok, 1 row affected (0.00 sec)

mysql>
mysql> insert into employee(id,first_name, last_name, start_date, end_date,   salary,  city,       description)
    ->               values(3,'james',    'smith',    '19781212', '19900315', 6544.78, 'vancouver','tester');
query ok, 1 row affected (0.02 sec)

mysql>
mysql> insert into employee(id,first_name, last_name, start_date, end_date,   salary,  city,       description)
    ->               values(4,'celia',    'rice',     '19821024', '19990421', 2344.78, 'vancouver','manager');
query ok, 1 row affected (0.00 sec)

mysql>
mysql> insert into employee(id,first_name, last_name, start_date, end_date,   salary,  city,       description)
    ->               values(5,'robert',   'black',    '19840115', '19980808', 2334.78, 'vancouver','tester');
query ok, 1 row affected (0.00 sec)

mysql>
mysql> insert into employee(id,first_name, last_name, start_date, end_date,   salary,  city,       description)
    ->               values(6,'linda',    'green',    '19870730', '19960104', 4322.78,'new york',  'tester');
query ok, 1 row affected (0.00 sec)

mysql>
mysql> insert into employee(id,first_name, last_name, start_date, end_date,   salary,  city,       description)
    ->               values(7,'david',    'larry',    '19901231', '19980212', 7897.78,'new york',  'manager');
query ok, 1 row affected (0.00 sec)

mysql>
mysql> insert into employee(id,first_name, last_name, start_date, end_date,   salary,  city,       description)
    ->               values(8,'james',    'cat',     '19960917',  '20020415', 1232.78,'vancouver', 'tester');
query ok, 1 row affected (0.00 sec)

mysql>
mysql> insert into job (id, title) values (1,'tester');
query ok, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (2,'accountant');
query ok, 1 row affected (0.02 sec)

mysql> insert into job (id, title) values (3,'developer');
query ok, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (4,'coder');
query ok, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (5,'director');
query ok, 1 row affected (0.02 sec)

mysql> insert into job (id, title) values (6,'mediator');
query ok, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (7,'proffessor');
query ok, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (8,'programmer');
query ok, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (9,'developer');
query ok, 1 row affected (0.00 sec)

mysql>
mysql> * from job;
+------+------------+
| id   | title      |
+------+------------+
|    1 | tester     |
|    2 | accountant |
|    3 | developer  |
|    4 | coder      |
|    5 | director   |
|    6 | mediator   |
|    7 | proffessor |
|    8 | programmer |
|    9 | developer  |
+------+------------+
9 rows in set (0.00 sec)

mysql> select * from employee;
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| id   | first_name | last_name | start_date | end_date   | salary  | city      | description |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
|    1 | jason      | martin    | 1996-07-25 | 2006-07-25 | 1234.56 | toronto   | programmer  |
|    2 | alison     | mathews   | 1976-03-21 | 1986-02-21 | 6661.78 | vancouver | tester      |
|    3 | james      | smith     | 1978-12-12 | 1990-03-15 | 6544.78 | vancouver | tester      |
|    4 | celia      | rice      | 1982-10-24 | 1999-04-21 | 2344.78 | vancouver | manager     |
|    5 | robert     | black     | 1984-01-15 | 1998-08-08 | 2334.78 | vancouver | tester      |
|    6 | linda      | green     | 1987-07-30 | 1996-01-04 | 4322.78 | new york  | tester      |
|    7 | david      | larry     | 1990-12-31 | 1998-02-12 | 7897.78 | new york  | manager     |
|    8 | james      | cat       | 1996-09-17 | 2002-04-15 | 1232.78 | vancouver | tester      |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
8 rows in set (0.00 sec)

mysql>
mysql>
mysql>
mysql> delete employee
    -> from employee, job
    -> where (employee.id = job.id)
    -> and (job.id = 3);
query ok, 1 row affected (0.00 sec)

mysql>
mysql>
mysql> select * from employee;
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| id   | first_name | last_name | start_date | end_date   | salary  | city      | description |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
|    1 | jason      | martin    | 1996-07-25 | 2006-07-25 | 1234.56 | toronto   | programmer  |
|    2 | alison     | mathews   | 1976-03-21 | 1986-02-21 | 6661.78 | vancouver | tester      |
|    4 | celia      | rice      | 1982-10-24 | 1999-04-21 | 2344.78 | vancouver | manager     |
|    5 | robert     | black     | 1984-01-15 | 1998-08-08 | 2334.78 | vancouver | tester      |
|    6 | linda      | green     | 1987-07-30 | 1996-01-04 | 4322.78 | new york  | tester      |
|    7 | david      | larry     | 1990-12-31 | 1998-02-12 | 7897.78 | new york  | manager     |
|    8 | james      | cat       | 1996-09-17 | 2002-04-15 | 1232.78 | vancouver | tester      |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
7 rows in set (0.00 sec)

方法二

mysql> delete ab
    -> from authorbook as ab, authors as a
    -> where ab.authid=a.authid and authln='a';
query ok, 1 row affected (0.05 sec)

mysql>
mysql> drop table authorbook;
query ok, 0 rows affected (0.06 sec)

mysql> drop table books;
query ok, 0 rows affected (0.05 sec)

mysql> drop table authors;
query ok, 0 rows affected (0.06 sec)

同时删除二个表

mysql> delete employee, job
    -> from employee, job
    -> where (employee.id = job.id)
    -> and (job.id = 3);
query ok, 2 rows affected (0.01 sec)

mysql>
mysql>
mysql>
mysql> select * from employee;
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| id   | first_name | last_name | start_date | end_date   | salary  | city      | description |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
|    1 | jason      | martin    | 1996-07-25 | 2006-07-25 | 1234.56 | toronto   | programmer  |
|    2 | alison     | mathews   | 1976-03-21 | 1986-02-21 | 6661.78 | vancouver | tester      |
|    4 | celia      | rice      | 1982-10-24 | 1999-04-21 | 2344.78 | vancouver | manager     |
|    5 | robert     | black     | 1984-01-15 | 1998-08-08 | 2334.78 | vancouver | tester      |
|    6 | linda      | green     | 1987-07-30 | 1996-01-04 | 4322.78 | new york  | tester      |
|    7 | david      | larry     | 1990-12-31 | 1998-02-12 | 7897.78 | new york  | manager     |
|    8 | james      | cat       | 1996-09-17 | 2002-04-15 | 1232.78 | vancouver | tester      |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
7 rows in set (0.00 sec)

mysql>
mysql> select * from job;
+------+------------+
| id   | title      |
+------+------------+
|    1 | tester     |
|    2 | accountant |
|    4 | coder      |
|    5 | director   |
|    6 | mediator   |
|    7 | proffessor |
|    8 | programmer |
|    9 | developer  |
+------+------------+
8 rows in set (0.00 sec)