摘要: 1 A、B两表共有 select * from tbl_emp a inner join tbl_dept b on a.deptId = b.id; 2 A、B两表共有+A的独有 select * from tbl_emp a left join tbl_dept b on a.deptId = 阅读全文
posted @ 2017-10-18 16:26 斜杠小青年 阅读(5017) 评论(0) 推荐(0)