Hi, I've setup a simple system. where a user can make a post and it will be visible to his friends. His/her friends can then place a vote on that post.
These are my tables.
posts(post_id, user_id, post)
1 1 John's post
2 3 Jacob's post
3 2 Mary's post
vote(user_id, post_id, up, down)
1 1 1 0
2 1 0 1
This is my query.
"SELECT DISTINCT dbUsers.*, dbPosts.*, dbKarma.*;
LEFT JOIN users
ON posts.username_id = users.id
LEFT JOIN friends
ON (posts.username_id = friends.my_id)
(posts.username_id = friends.friend_id)
LEFT JOIN vote
ON posts.post_id = vote.post_id
The problem is if there is more then 1 vote on a particular post, it will be duplicated. If there are 2 votes on that post it will be duplicated twice.. and 3 votes, duplicated three times.
Why is this happening?