关于表的连接：关联uid和gid？

Question

********      * *********
              *  GROUPS
                 -------------    
users         *  uid(Primary KEy)
                 gname        
------        *  gdesc
uid            *
username        * 
password         * 
FULL_NAME         *
date_of_birth     * 
phone_number      *
valid            *
manu_gps
editor_map
operator
gid (Foreign Key) reference to GROUPS(uid)

您可以帮助SQL查询吗？我应该加入这个表格。换句话说，我应该把关联gid和uid，而不是gid pun适当的gname

Answer 1

尝试类似

的内容

SELECT u.uid,
       u.username,
       g.uid,
       g.gname
       FROM users u
            LEFT JOIN groups g
                      ON g.uid = u.gid;