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mysql DElEtE中whErE后能套用sElECt么

delete from table where id in (select user_id from table2)

delete from posts_99 where authorid in (select authorid from posts_99 group by authorid having count(message)

DELETE FROMheartbeat2_tb WHEREid not in (SELECTmin(id)FROMheartbeat2_tbGROUP BY(devname+psamid+roadid)HAVINGcount(*) > 1)

不能先select出同一表中的某些值,再update这个表(在同一语句中) 解决方案 --1.把需要删除的数据放到另外的一张表里create table table_test as select oneName from one group by OneName,OneAge,oneSex,oneAddress having count(oneName) > 1;...

第一个对,第二个不对

mysql 删除可以用子查询。 mysql删除子查询中的记录语句: Sql代码 delete from t_5star where locationid in ( select e.locationid from ( select a.* from t_5star as a , t_als_data as b where a.term = b.term ) e ) 关键是子查询中的语句...

delete from A where ID in (1,2,3) and ID not in(select ID from B) 或 delete from A where not exists (select ID from B where ID=A.ID) and ID in (1,2,3)

你要是只要删除ss表 中的数据 直接用以下的方法就可以了 delete ss from dbo.Login ss inner join Server gs on ss.ServerId=gs.ServerId inner join Area ga on gs.AreaId=ga.AreaId inner join Game g on ga.GameId=g.GameID where g.GameId=5...

一使用SELECT子句进行多表查询 SELECT 字段名 FROM 表1,表2 … WHERE 表1.字段 = 表2.字段 AND 其它查询条件 SELECT a.id,a.name,a.address,a.date,b.math,b.english,b.chinese FROM tb_demo065_tel AS b,tb_demo065 AS a WHERE a.id=b.id 注:在...

改成2句话,先算然后再删除

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