#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;

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#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

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