I have a table which contains UserId & his Friends Id like:

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UserFriendsId    |    UserId    |    FriendId
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     1                  1              2
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     2                  1              3
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     3                  2              1
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     4                  2              3
----------------------------------------------

This table data shows that User-1 & User-2 are friend & they also have frndship with User-3. Now I want to find common friend(s) among UserId 1 & UserId 2 for eg: In sentance my query is: User 1 & User 2 have 1 common Friend FriendId 3.

For this I used SQL query for INNER JOIN:

SELECT t1.* FROM userfriends t1 INNER JOIN userfriends t2 ON t1.FriendId = t2.FriendId WHERE t1.UserId = 2

But not return required result..