--一个连接查询,在Bn_scenes中去掉一些记录。
select * from UFSystem..BN_Scenes where bSysVisible='1' and cBizSceneId not in (select cBizSceneId from BN_ScenesCustom where userid='likun5') order by iorder asc
使用exists
select * from UFSystem..BN_Scenes where bSysVisible='1' and not exists(select cBizSceneId from BN_ScenesCustom where userid='demo' AND BN_Scenes.cBizSceneId=BN_ScenesCustom.cBizSceneId)
两个查询执行的结果和效率一样。