DELETE t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15
FROM product t1
LEFT JOIN product_attribute t2 ON(t1.product_id=t2.product_id)
LEFT JOIN product_description t3 ON(t1.product_id=t3.product_id)
LEFT JOIN product_discount t4 ON(t1.product_id=t4.product_id)
LEFT JOIN product_image t5 ON(t1.product_id=t5.product_id)
LEFT JOIN product_option t6 ON(t1.product_id=t6.product_id)
LEFT JOIN product_option_value t7 ON(t1.product_id=t7.product_id)
LEFT JOIN product_related t8 ON(t1.product_id=t8.product_id)
LEFT JOIN product_reward t9 ON(t1.product_id=t9.product_id)
LEFT JOIN product_special t10 ON(t1.product_id=t10.product_id)
LEFT JOIN product_to_category t11 ON(t1.product_id=t11.product_id)
LEFT JOIN product_to_download t12 ON(t1.product_id=t12.product_id)
LEFT JOIN product_to_layout t13 ON(t1.product_id=t13.product_id)
LEFT JOIN product_to_store t14 ON(t1.product_id=t14.product_id)
LEFT JOIN review t15 ON(t1.product_id=t15.product_id)
WHERE t11.category_id = '146' AND t1.manufacturer_id = '49'