-- 创建存储过程 DELIMITER // CREATE PROCEDURE DeleteDataFromMultipleTables() BEGIN DELETE FROM B WHERE userId = 'some_id'; DELETE FROM A WHERE id = 'some_id'; END // DELIMITER ; -- 调用存储过程 CALL DeleteDataFromMultipleTables(); 3. 使用触发器 触发器可以在执行特定操作时自动执行一段...
DML 的主要功能是访问数据,因此其语法都是以读写数据库为主。 DML 的核心指令是INSERT、UPDATE、DELETE、SELECT。这四个指令合称 CRUD(Create, Read, Update, Delete),即增删改查。 事务控制语言(TCL) 事务控制语言 (Transaction Control Language, TCL) 用于管理数据库中的事务。这些用于管理由 DML 语句所做的更...
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在Delete SQL语句中使用Join,可以通过以下方式实现: DELETE t1 FROM table1 t1 JOIN table2 t2 ON t1.column_name = t2.column_name WHERE condition; 复制代码 在上面的语句中,table1是要删除数据的表,table2是需要连接的表。通过JOIN关键字指定连接条件,然后在WHERE子句中添加要删除的数据的条件。 请注意,使...
另一种写法(mysql> DELETE FROM t1,t2 USING teacher AS t1 INNER JOIN student AS t2 WHERE t1.t_id = t2.stu_id;) 三.DROP、TRUNCATE和DELETE的区别 1>.drop drop是DDL,会隐式提交,所以,不能回滚,不会触发触发器。 drop语句删除表结构及所有数据,并将表所占用的空间全部释放。
In structured query language (SQL), the DELETE JOIN statement is used to delete rows from multiple tables, or depending on the type of join operation used in the query, all rows from a first table are deleted and the matching rows from a second table. ...
SELECT * FROM @boy b INNER JOIN( @relationship r INNER JOIN @girl g ON(r.girl_id = g.id AND g.name = 'Winona Ryder')) ON b.id = r.boy_id SELECT id, name, is_stud FROM @boy ; DELETE t1 FROM productappraise t1 INNER JOIN product t2 ON t1.productid=t2.productid WHERE t...
SQL INNER JOIN Summary: in this tutorial, you will learn how to query data from multiple tables usingSQL INNER JOINstatement. In the previous tutorial, you learned how to query data from a single table using theSELECT statement. However, you often want to query data from multiple tables to...
EN写过或者学过 Sql 的人应该都知道 left join，知道 left join 的实现的效果，就是保留左表的全部...
问SQL -从多个表中删除(使用FK)EN--创建测试表 if object_id('test') is not null drop ...