MySQL exec Zeit schwarze Magie

Question

So meine MySQL-Abfrage wurde für 25 Sekunden jedes Mal geladen. Ich habe die Abfrage geteilt und herausgefunden, dass sie ohne eine der WHERE-Bedingungen perfekt funktioniert. Bedingung verursachendes Problem ist:

eshop_products.id IN 
(SELECT product-id 
    FROM eshop_productCombinations 
    WHERE eshop_productCombinations.recomended = 1 
    GROUP BY product-id) 

Ohne diese Bedingung dauerte Abfrage 0,019 Sekunden zu laden. ABER, wenn ich diese wählt separat ausführen, dauert es nur 0,026 Sekunden laden:

SELECT product-id 
FROM eshop_productCombinations 
WHERE eshop_productCombinations.recomended = 1 
GROUP BY product-id 

Hat jemand eine Ahnung, was mit meiner Haupt-Abfrage falsch ist? Vielen Dank.

Hier vollständige Abfrage (obwohl ich es für jeden nützlich sein würde nicht denken):

SELECT 
CAST(
    SUBSTRING_INDEX(
    GROUP_CONCAT(
     price_with_vat ORDER BY IF(eshop_products_cache.`stock` > 0, 1, 0) DESC, 
     IF(
     eshop_products.`type_default_price`=2,eshop_products_cache.`price_with_vat`, 
     if(
      eshop_products.`type_default_price`=0,eshop_products_cache.`default`,null 
     ) 
    ) DESC, 
     IF(eshop_products.`type_default_price`=1,eshop_products_cache.`price`, null) ASC 
    ), 
    ", 
    ", 
    1 
) AS DECIMAL(10,2) 
) AS `price_with_vat`, 
SUBSTRING_INDEX(
    GROUP_CONCAT(
    eshop_products_cache.combination_id ORDER BY IF(eshop_products_cache.`stock` > 0, 1, 0) DESC, 
    IF(
     eshop_products.`type_default_price`=2, 
     eshop_products_cache.`price_with_vat`, 
     if(
     eshop_products.`type_default_price`=0, 
     eshop_products_cache.`default`, 
     null 
    ) 
    ) DESC, 
    IF(eshop_products.`type_default_price`=1,eshop_products_cache.`price`, null) 
    ASC 
), 
    ", 
    ", 
    1 
) AS `combination_id`, 
if(eshop_products.id in ('5993', '6144', '6663', '5120', '5376', '5632', '5888', '6400', '6656', '5121', '5377', '5633'), 1, 0) AS new 
FROM `eshop_products` LEFT JOIN `eshop_products_cache` ON eshop_products_cache.product_id=eshop_products.`id` WHERE 
(
    (
    (
     eshop_products.stockType = 2 AND eshop_products_cache.stock > 0 
    ) 
    OR eshop_products.stockType <> 2 
) 
) 
AND 
(
    price_with_vat > 0 
) 
AND 
(
    eshop_products.recomended = 1 
    OR 
    eshop_products.id IN (
    SELECT `product-id` FROM eshop_productCombinations WHERE eshop_productCombinations.recomended = 1 GROUP BY `product-id` 
) 
) 
AND 
(
    eshop_products.active = '1' 
) 
AND (dateStartPublish <= NOW() OR dateStartPublish IS NULL) 
AND (dateStopPublish >= NOW() OR dateStopPublish IS NULL) 
GROUP BY `eshop_products`.`id`, `eshop_products_cache`.`product_id` ORDER BY RAND() ASC LIMIT 5 

Answer 1

von Anthony Vorgeschlagen hat Unterabfrage unten mit Code ersetzt werden:

EXISTS (
    SELECT 1 FROM eshop_productCombinations 
    WHERE eshop_productCombinations.recomended = 1 
    AND product-id = eshop_products.id)