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Rawb is right on both suggestions. If your database has over, say, 100,000 records, you will want to de-normalize the data. Otherwise, you have to perform that query, which has a subselect containing a group by, then joining and comparing the joined data each time that query is hit. Assuming it's a frequently hit page, it will cause high load on your database server.
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Patterns have a habit of repeating themselves.
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