How to write a MySQL Join query

Question

I\'ve two tables.

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


        

Answer 1

SELECT * FROM 
    users INNER JOIN groupmember 
      ON users.uid = groupmember.uid
         AND groupmember.groupid = 16
         AND users.city = 'Tokyo'

Answer 2

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

Answer 3

select u.* from users u join groupmember gm on u.uid = gm.uid 
where u.city='Tokyo' and gm.groupid=16

Answer 4

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;