mysql join的七種方式

join的七種方式： 1 A、B兩表共有blog select * from tbl_emp a inner join tbl_dept b on a.deptId = b.id;io 2 A、B兩表共有+A的獨有class select * from tbl_emp a left join tbl_dept b on a.deptId = b.id;select 3 A、B兩表共有+B的獨有ni

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