MySQL：如何优化此查询？

Question

我几乎花了一天时间来优化此查询：

SELECT 
    prod. *, 
    cat.slug category_slug, 
    sup.bname bname, 
    sup.slug bname_slug
FROM bb_admin.bb_directory_products AS prod
LEFT JOIN bb_admin.bb_categories_products AS cat 
    ON prod.primary_category_id = cat.category_id
LEFT JOIN bb_admin.bb_directory_suppliers AS sup 
    ON prod.supplier_id = sup.supplier_id
LEFT JOIN bb_admin.bb_directory_suppliers AS credit_sup 
    ON prod.credit_supplier_id = credit_sup.supplier_id
LEFT JOIN bb_admin.bb_directory_suppliers AS photo_sup 
    ON prod.photo_supplier_id = photo_sup.supplier_id
WHERE (
    prod.status = '1'
    OR prod.status = '3'
    OR prod.status = '5'
)
    AND (
        sup.active_package_id != '1'
        OR sup.active_package_id != '5'
        OR sup.active_package_id != '6'
        OR prod.supplier_id = '0'
    )
    AND (
        sup.supplier_id = '1989'
        OR credit_sup.supplier_id = '1989'
        OR photo_sup.supplier_id = '1989'
    )
GROUP BY prod.product_id
ORDER BY prod.priority_index ASC

您能帮我优化此查询吗？

Answer 1

1. 将列数据类型更新为INT或它的变体之一，因为要检查的列数据类型都是整数ID（假设）。

2. 在以下列上创建索引（如果可能，请在所有表中）：

   • 产品状态
   • Supplier_id
   • active_package_id
3. 使用IN子句，而不是串联OR段。

我将更新后的WHERE子句放在这里：

WHERE prod.status IN(1, 3, 5)
    AND ( sup.active_package_id NOT IN(1, 5, 6)
        OR prod.supplier_id = 0
    )
    AND 1989 IN (prod.supplier_id, prod.credit_supplier_id, prod.photo_supplier_id)