SQL聯合查詢：子表任一記錄與主表聯合查詢

     今天有網友羣裏提了這樣一個關於SQL聯合查詢的需求：      一、有熱心網友的方案：   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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