Help with a 'tag' database select statement

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Help with a 'tag' database select statement

Author

Topic

lkelly
Starting Member

2 Posts

Posted - 2010-08-11 : 11:58:36

I have built a relatively simple group of tables to represent tags applied to a video. Sample tables are:



tbl_video
vid_id  vid_name  vid_description
1       test vid  test description
2       red vid   video is red
3       blue vid  video is blue

tbl_tags
tag_id  tag_name
1       new
2       old
3       interesting
4       boring

tbl_video_tags
vid_id  tag_id
1       1
1       3
2       1
3       2
3       3
4       4

I'm looking for a query that will return all the fields in tbl_vid that match a LIST of tag_ids. (In this case tbl_tags isn't really needed for my example, but I'm including it for clarity.) For example, I would like to return the fields in tbl_video for all videos that are new (tag_id = 1) AND interesting (tag_id = 3). The result set would be the row for test_vid.

Can someone help? I have a query that returns all records with tag_ids of 1 OR 3, but not tag_ids 1 AND 3.

Thanks in advance - hopefully I have explained the situation clearly.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2010-08-11 : 12:12:39

[code]
SELECT v.*
FROM tbl_video v
INNER JOIN (SELECT vid_id
FROM tbl_video_tags
WHERE tag_id IN (1,3)
GROUP BY vid_id
HAVING COUNT(DISTINCT tag_id) = 2
)t
ON t.vid_id = v.vid_id
[/code]

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SQL Server MVP
http://visakhm.blogspot.com/

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