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
