查詢avoding subselect

Question

我有這個查詢，它非常緩慢。例如，我可以通過避免子查詢以其他方式編寫此查詢嗎？

而且我試着

MyIndex(kategorije_id,izdvojen,izdvojen_kad,datum) 

加入綜合指數，但它doesent使用它時，我解釋這個查詢，以便在那裏，我可以用它來加快這個查詢另一個指標？

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

嘗試此查詢：

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 
    ); 

請檢查。

Answer 2

嘗試此查詢 -

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

我已刪除ORDER BY和LIMIT子句從查詢;嘗試首先解決這個問題。