MySQL的join使用

#内连接
select * from auth_user u inner join auth_group g on u.id = g.id;

#左连接
select * from auth_user a left join auth_group b on a.id = b.id;

#右连接
select * from auth_user a right join auth_group b on a.id = b.id;

#左链接-内连接
select * from auth_user a left join auth_group b on a.id = b.id where b.id is null;

#右连接-内连接
select * from auth_user a right join auth_group b on a.id = b.id where b.id is null;

#MySQL外连接不让使用full join 或者full outer join

posted @   坏虫  阅读(447)  评论(0编辑  收藏  举报
努力加载评论中...
点击右上角即可分享
微信分享提示