postgresql 左连接三张表:
select A.col1,B.col2,C.col3 from (A left join B on a.col3 = b.col1)
left join c on A.col3 = C.col1
Where ......+ 条件
postgresql 左连接三张表:
select A.col1,B.col2,C.col3 from (A left join B on a.col3 = b.col1)
left join c on A.col3 = C.col1
Where ......+ 条件
