如图所示的A,B,C,D四个表,其中A2是B,C,D三个表的外键,且B,C,D之间也有对应关系
现在想输出图片下方的结果,sql怎么写呢?
求教!
先把表和主外键弄好,就可以拿了呀
select a.A1,b.B1,b.C1,d.D1 from a inner join b on a.A2=b.ID inner join c on a.A2=c.ID inner join d on a.A2=d.ID
select a.A1,b.B1,b.C1,d.D1 from a inner join b on a.A2=b.ID inner join c on a.A2=c.ID inner join d on a.A2=d.ID