Ingo Weiss schrieb:
Hi all,
I have an application where items can be tagged. There are three tables
'items', 'taggings' and 'tags' joined together like this:
items inner join taggings on (items.id = taggings.item_id) inner join
tags on (tags.id = taggings.tag_id)
Now I have been struggling for some time now with coming up with the SQL
to find the items the tags of which include a specified list of tag
names. Example:
I am looking for items tagged with 'blue' and 'red'. This should find me:
- items tagged with 'blue' and 'red'
- items tagged with 'blue', 'red' and 'green'
SELECT DISTINCT items.*
FROM [your join above]
WHERE tags.name IN ('blue', 'red');
--
Sebastian Mendel
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