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
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