既然是两个实体,那么你为什么要硬扯在一起呢?难道要设计两个中间表吗? ------解决方案-------------------- select * from A left join A_B on A.id=A_B.aid left join A_C on A.id=A_C.aid ------解决方案-------------------- 那是当然的!
但只需要 INNER JOIN 就可以了
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