SQL联合查询：子表任一记录与主表联合查询

     今天有网友群里提了这样一个关于SQL联合查询的需求：      一、有热心网友的方案：   二、我的方案： select * from ( select a.*,(select top 1 Id from B as b where b.CgId =a.ID)as bid from A as a ) as temp left join B as b2 on temp.bid=b2.Id  

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