oracle多表关联删除的两种方法 第一种使用exists方法 delete from tableA where exits ( select 1 from tableB Where tableA.id = tableB.id ) 第二种使用匿名表方式进行删除 delete from ( select 1 from tableA,TableB where tableA.id = tableB.id ) 这种方法只适合两个表都有主键或外键的时候,若是关联一个管道函数就无法删除成功,会提示错误
在SQL中,经常用到关联查询,比如select a.* from A a inner join B b on a.PId=b.FId where 条件,SQL中也支持类似的关联更新和关联删除. 关联更新语法: update a set a.字段=” from A a inner join B b on a.PId=b.FId where 条件 关联删除语法: delete from a from A a inner join B b on a.PId=b.FId where 条件 注解:A,B为
oracle多表关联删除的两种方法 第一种使用exists方法 delete from tableA where exits ( select 1 from tableB Where tableA.id = tableB.id ) 第二种使用匿名表方式进行删除 delete from ( select 1 from tableA,TableB where tableA.id = tableB.id ) 这种方法只适合两个表都有主键或外键的时候,若是关联一个管道函数就无法删除成功,会提示错误
参考网址:http://www.111cn.net/database/mysql/51146.htm 原网页广告太多,自己抄了下. 1.delete from t1 where 条件2.delete t1 from t1 where 条件3.delete t1 from t1,t2 where 条件4.delete t1,t2 from t1,t2 where 条件前3者是可行的,第4者不可行.也就是简单用delete语句无法进行多表删除数据操作,不过可以建立级联删除,在两个表之间建立级联删除关
基本格式: DELETE t1 FROM t1,t2 WHERE t1.id=t2.id 或 DELETE FROM t1 USING t1,t2 WHERE t1.id=t2.id 示例应用: DELETE coupon FROM coupon,member WHERE coupon.mem_no=member.reg_no AND coupon.`status`=0 AND coupon.`batch_no`='yaoqingpengyou001' AND member.`mobile`
现有6张表存在关联关系,要删除主表则其他5张表关联数据也要一块删掉(单条sql多id批量删除) delete t1,t2,t3,t4,t5,t6 FROM rmd_v AS t1 LEFT JOIN rmd_v1 AS t2 ON t1.uuid = t2.rvuuid LEFT JOIN rmd_v2 AS t3 ON t1.uuid = t3.rvuuid LEFT JOIN rmd_v3 AS t4 ON t1.uuid = t4.rvuuid LEFT JOIN rmd_v4 AS t5
DELETE OPENQUERY (VERYEAST_COMPANY_MYSQL_CONN, 'SELECT * FROM company ') WHERE c_userid in(select c_userid from #company_information) 修改为 DELETE OPENQUERY (VERYEAST_COMPANY_MYSQL_CONN, 'SELECT c_userid FROM company ') WHERE c_userid in(select c_useri
1.查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count (peopleId) > 1) 2.删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录delete from people where peopleId in (se
删除用户数据,我们就需要删除有关用户的所有数据. 主表是有数据的,其他关联表不一定有数据,我们可以用left join 来关联删除的表. eg:table1 是主表,t2,t3是关联表. SELECT t1,t2,t3 FROM t_table t1 LEFT JOIN t_table2 t2 ON t1.id = t2.table1_id LEFT JOIN t_table3 t3 ON t1.id = t3.table1_id WHERE t1.id