Question : Eliminate rows in multiple table query

I'm trying to make a query to get unique results and also eliminate some of them.

So I'm trying to make a system like last.fm structure.
members can add any content to their favorites (for example a song). and all songs can be linked by other songs. (A song linked by B song. like last.fm) Then if member add "A song" to his favorites, system suggest him "B song". but because off cross linking in database, results contain A and B song together. so system need to eliminate A song because of it's already in user's favorite.

My linked contents and favorites table same as following :

CREATE TABLE `content_link` (
`id` int(10) unsigned NOT NULL auto_increment,
`content_id` int(10) unsigned NOT NULL default '0',
`linked_id` int(10) unsigned NOT NULL default '0',
)

CREATE TABLE `content_favorites` (
`favorite_id` int(11) NOT NULL auto_increment,
`content_id` int(11) NOT NULL,
`members` int(11) NOT NULL,
)

I'm trying to use the line below to get results (in fact I tried many others but I couldnt achieve):

SELECT DISTINCT olink.content_id FROM content_link AS olink, content_favorites AS ofav WHERE ofav.content_id=olink.linked_id AND ofav.members_id ='2'

Only that I need eliminate results which are same with "content_favorites"'s content_id. But I couldnt achieve this.(I tried inner, outer, right, left join combinations and my mind is outer joined now!)

I hope anyone has an idea on that

my tables content example like following :

CONTENT_LINK (I'm using cross linking for every linked items)
content_id :1 - linked_id : 3
content_id :3 - linked_id : 1
content_id :1 - linked_id : 5
content_id :5 - linked_id : 1

CONTENT_favorites
content_id :1 - members_id : 2
content_id :3 - members_id : 2

on the other hand, my table structure may not be appropiate. if it is, please suggest me new kind of structure

Answer : Eliminate rows in multiple table query

Try this instead

                       
             SELECT DISTINCT olink.linked_id
FROM	content_link AS olink
WHERE
	olink.content_id = 
	AND olink.linked_id NOT IN (
		SELECT ofav.content_id FROM content_favorites AS ofav WHERE members = 
	)

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Question : Eliminate rows in multiple table query

Answer : Eliminate rows in multiple table query

Try this instead 1: 2: 3: 4: 5: 6: 7: SELECT DISTINCT olink.linked_id FROM content_link AS olink WHERE olink.content_id = AND olink.linked_id NOT IN ( SELECT ofav.content_id FROM content_favorites AS ofav WHERE members = ) Open in New Window Select All

Try this instead

1: 2: 3: 4: 5: 6: 7:

SELECT DISTINCT olink.linked_id FROM content_link AS olink WHERE olink.content_id = AND olink.linked_id NOT IN ( SELECT ofav.content_id FROM content_favorites AS ofav WHERE members = )

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