SQL statement to join data from two tables

Posted on 2008-10-10
Medium Priority
Last Modified: 2010-03-20

I have two tables:

    | id  | username    |
       1       john
       2       frank  
       3       steve
       4       bob

    | id  | id_user1  |  id_user2 |
       1          2               1
       2          2               4

I want to write a statement which will give me a listing of all ids and usernames from the users table give a user ID from the friends table.

So in the above example, I want to get a listing of frank's friends' ids and usernames:

      1, john
      4, bob

I guess this should use some sort of inner join, but im not sure how to do it?

Question by:DJ_AM_Juicebox
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Accepted Solution

Binuth earned 2000 total points
ID: 22692624
try this
	users u
INNER JOIN friends f 
	ON u.id = f.id_user2
	f.id_user1 = 2

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Expert Comment

ID: 22692638
It depends on what your criteria of search is....

Are you using the username or the userID?

WHERE username = 'frank'


WHERE id = 2

Expert Comment

ID: 22692647
SELECT u.id, u.username
FROM friends f
INNER JOIN users u
ON f.id_user2 = u.id
WHERE f.id_user1 = '2'


SELECT u.id, u.username
FROM friends f
INNER JOIN users u
on f.id_user2 = u.id
INNER JOIN users x
ON f.id_user1 = x.id
WHERE x.username = 'frank'

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