FUNCTION products.IF does not exist. Check the 'Function Name Parsing and Resolution' section in the Reference Manual<hr>
    SELECT products.productID, products.IF(LENGTH(`name_en`), `name_en`, `name_ru`) AS name, products.Price, products.slug
    FROM SC_products products
    LEFT JOIN SC_categories categories
    USING(categoryID)
    WHERE products.enabled = 1 AND products.productID &lt;&gt; 3836 AND (products.categoryID = 766 OR categories.parent = 766)
    LIMIT 5