Vitaly,
This looks like there might be some room for performance improvement...
> MS> I didn't see the table structure, but I assume > MS> that the vote_avg and > MS> vote_count fields are in bv_bookgenres. > > I didn't understand you. vote_avg is stored in bv_books.
Ok. That helps. The confusion (on my end) came from the SELECT clause of the query you provided:
> SELECT bv_books. * , > vote_avg, > vote_count
All fields from bv_books were selected (bv_books.*) along with vote_agv and vote_count. My assumption was that vote_avg and vote_count were therefore not in bv_books.
At any rate, a query with an IN clause should help quite a bit:
SELECT bv_books. *
FROM bv_books
WHERE bv_books.book_id IN (
SELECT book_id
FROM bv_genres
WHERE bv_bookgenres.genre_id = 5830
)
ORDER BY vote_avg DESC LIMIT 10 OFFSET 0;Give it a whirl.
Marty
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