CALL DeleteMultipleTables(); 验证数据删除 执行完删除操作后,你应该验证数据是否已被成功删除。这可以通过执行SELECT查询来验证。 sql SELECT * FROM table1 WHERE condition1; SELECT * FROM table2 WHERE condition2; SELECT * FROM table3 WHERE condition3; 如果上述查询没有返回任何结果,说明数据已被成功...
DELIMITER // CREATE PROCEDURE DeleteMultipleTables() BEGIN DELETE FROM table1 WHERE condition; DELETE FROM table2 WHERE condition; DELETE FROM table3 WHERE condition; END // DELIMITER ; 然后调用这个存储过程: 代码语言:txt 复制 CALL DeleteMultipleTables(); 优势: 可以封装复杂的删除逻辑,便于复用。 ...
Summary: in this tutorial, you will learn how to useMySQL ON DELETE CASCADEreferential action for a foreign key to delete data from child tables when you delete data from a parent table. In the previous tutorial, you learned how to delete data from multiple related tables by using a single...
CALL DeleteMultipleTables(); 可能遇到的问题及解决方法 权限问题:如果用户没有足够的权限执行存储过程,会报错。解决方法是为用户授予相应的权限。 权限问题:如果用户没有足够的权限执行存储过程,会报错。解决方法是为用户授予相应的权限。 表不存在:如果表不存在,执行删除操作会报错。解决方法是在存储过程中添加表存在...
Delete from Multiple Tables zaver xaver March 26, 2009 07:34AM Re: Delete from Multiple Tables Guelphdad Lake March 26, 2009 07:56AM Re: Delete from Multiple Tables zaver xaver March 26, 2009 08:09AM Sorry, you can't reply to this topic. It has been closed....
Summary: in this tutorial, we will show you how to delete data from multiple tables by using MySQL DELETE JOIN statement. In the previous tutorial, you learned how to delete rows of multiple tables by using: A single DELETE statement on multiple tables. A single DELETE statement on multiple...
MySQL DELETE JOIN语句 Summary: in this tutorial, we’ll show you how to delete data from multiple tables by usingMySQL DELETE JOINstatement. In the previous tutorial, we showed you several ways to delete records from multiple tables by using:...
Besides deleting data from a table, theDELETEstatement returns the number of rows deleted. To delete data from multiple tables using a singleDELETEstatement, you use theDELETE JOINstatement which we will cover in thenext tutorial. To delete all rows in a table without the need of knowing how...
开始我们拿sql到数据库查询平台查库执行计划,无奈这个平台有bug,delete语句无法查看,所以我们改成select,“应该”是一样。这个“应该”加了双引号,导致我们走了一点弯路。 EXPLAIN SELECT * from t_table_1 where task_id in (select id from t_table_2 where uid = 1) ...
Summary: in this tutorial, you will learn how to use MySQL ON DELETE CASCADE referential action for a foreign key to delete data from multiple related tables. In the previous tutorial, you learned how to delete data from multiple related tables using a single DELETE statement. However, MySQL ...