Question

I’ve two tables.

users: 
       uid | city     | username | flag |
       10  | New York | john     | 1    |
       14  | Tokyo    | kawasaki | 1    |
       15  | Tokyo    | coder    | 1    |

groupmember: 
       id  | uid  | groupid  |
       1   | 10   | 16       |
       2   | 14   | 16       |
       3   | 15   | 21       |

The 'uid' in both the tables are the same.

I want to select all users who are in city “tokyo” who are also in the group with groupid “16” .

So the query resutl should be (in this case)

14  | Tokyo    | kawasaki | 1    |

Answer 1

SELECT u.uid, u.city, u.username, u.flag 
FROM users u
JOIN groupmember g ON u.uid = g.uid
WHERE u.city = 'Tokyo'
  AND g.groupid = 16;