Issue in mysql Join query

Question

I am developing a social website.I have an option called alerts which shows pending friend requests and unread messages.My query is following:

SELECT
  sk_friends.frndship_from_user_id,
  sk_messages.msg_from_user_id,
  sk_messages.msg_text,
  sk_messages.msg_date 
FROM
  sk_friends INNER JOIN sk_messages
WHERE 
  sk_messages.msg_to_user_id = '$user_id'
  AND sk_friends.frndship_to_user_id ='$user_id'  
  AND sk_friends.frndship_status = 'pending'
  AND sk_messages.msg_status='unread'
ORDER BY 
  sk_friends.fndship_date ASC,
  sk_messages.msg_date ASC;

sk_friends and ak_messages are tables.
msg_from_user_id is the id of sender
frndship_from_user_id is the id of the user who sends the request
$user_id is the id of the login user

Each row data is appearing twice. I dont know why does it happen.

you have missed ON statement in join query. check dev.mysql.com/doc/refman/5.0/en/join.html to apply inner join. — Ripa Saha
– Ripa Saha, Commented Feb 12, 2013 at 10:22
Use "ON" in place of "WHERE" in the JOIN-segment of your query. — illuzive
– illuzive, Commented Feb 12, 2013 at 10:23

Husman · Accepted Answer · 2013-02-12 10:21:49Z

4

Your inner join does not have an ON clause. Try adding one, that should remove double results.

answered Feb 12, 2013 at 10:21

Husman

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Comments

Chintan · Accepted Answer · 2013-02-12 11:03:17Z

0

Try this :

SELECT 
    sf.frndship_from_user_id,
    sm.msg_from_user_id,
    sm.msg_text,sm.msg_date 
FROM 
    sk_friends sf ,
    sk_messages sm 
WHERE 
    sm.msg_to_user_id = sf.frndship_to_user_id AND
    sm.msg_to_user_id = '$user_id'  AND     
    sf.frndship_status = 'pending' AND 
    sm.msg_status='unread' 
ORDER BY 
    sf.fndship_date ASC,sm.msg_date ASC;

answered Feb 12, 2013 at 11:03

Chintan

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