sqldelete语句及同时删除多表数据实现方法

[ 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)