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.

Answer 1

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