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
SQL联合查询:子表任一记录与主表联合查询
原文:http://www.cnblogs.com/johsan/p/5856469.html