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
从一个或多个表中删除满足条件的数据,其中的 table_references代表了多个表的join操作(mysql> DELETE Dept,students FROM Dept INNER JOIN students WHERE Dept.id =students.sid;) 除了上面的那种写法外,还可以用这种方式写也能达到相同的效果,如果有多张表继续使用INNER JOIN关键字继续跟上相应的表即可(mysql> D...
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-- 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...
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...
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. ...
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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...
首先你必须得指明你删除哪个表中的数据 DELETE Works FROM c_works Works JOIN c_works_attach Works_attach ON Works_attach.wid=Works.id JOIN c_works_image Works_image ON Works_image.wid=Works.id WHERE ( Works.id = 1 )其次，sql server的话，得分开写，不能写到一起，你可以写一个...
Interleaved tables are a mixed bag. Their theoretical pros are: improved performance for bulk inserts across multiple tables, if the data has a shared prefix, since the keys would go to the same range improved performance for joins on co...