Question

I have this query and it’s very slow. Can i write this query in other way by avoiding subselects for example?

Also i tried adding composite index on

MyIndex(kategorije_id,izdvojen,izdvojen_kad,datum)

but it doesent use it when i explain this query so is there another index that i can use to speed up this query?

SELECT artikli.datum AS brojx, artikli.izdvojen AS i, artikli.izdvojen_kad AS ii, artikli.name
FROM artikli
WHERE artikli.izbrisan =0
AND artikli.prodano !=3
AND artikli.zavrseno =0
AND artikli.od_id !=0
AND kategorije_id
IN ( 18 )
AND (
SELECT count( * )
FROM artikli_polja, polja
WHERE polja.id_kat = artikli.kategorije_id
AND artikli_polja.id_polja = polja.id
AND artikli_polja.id_artikal = artikli.id
AND polja.name = "godiste"
AND artikli_polja.valueInt >= "1993"
) >0
AND (
SELECT count( * )
FROM artikli_polja, polja
WHERE polja.id_kat = artikli.kategorije_id
AND artikli_polja.id_polja = polja.id
AND artikli_polja.id_artikal = artikli.id
AND polja.name = "godiste"
AND artikli_polja.valueInt <= "2000"
) >0
ORDER BY i DESC , ii DESC , brojx DESC
LIMIT 140 , 35

Answer 1

Try this query:

SELECT a.datum AS brojx, a.izdvojen AS i, a.izdvojen_kad AS ii, a.name 
FROM artikli a
WHERE a.izbrisan =0
AND a.prodano !=3
AND a.zavrseno =0
AND a.od_id !=0
AND a.kategorije_id = 18
AND EXISTS 
   (select 'X' 
   from artikli_polja ap,
   JOIN polja p
   ON ap.id_polja = p.id AND p.id_kat = a.kategorije_id
   AND ap.id_artikal = a.id
   AND p.name = 'godiste'
   AND ap.valueInt >= 1993 AND ap.valueInt <= 2000
   );

Please check.