mysql的七種join

有這樣兩個表：sql 1、blog sql語句：io select * from tbl_dept a inner join tbl_emp b on a.id = b.depId;bfc 2、select sql語句：sql語句 select * from tbl_dept a left join tbl_emp b on a.id=b.deptId;nio 3、im sql語句d3 selec

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