get all combinations prestashop

getallcombinations.sql

SELECT
    p.id_product,
    pa.reference,
    pa.upc,
    pa.price,
    pai.id_image,
    pl.name,
    GROUP_CONCAT(DISTINCT(pal.name) SEPARATOR ", ") as combination,
    pq.quantity
FROM ps_product p
LEFT JOIN ps_product_attribute pa ON (p.id_product = pa.id_product)
LEFT JOIN ps_stock_available pq ON (p.id_product = pq.id_product AND pa.id_product_attribute = pq.id_product_attribute)
LEFT JOIN ps_product_lang pl ON (p.id_product = pl.id_product)
LEFT JOIN ps_product_attribute_combination pac ON (pa.id_product_attribute = pac.id_product_attribute)
LEFT JOIN ps_attribute_lang pal ON (pac.id_attribute = pal.id_attribute)
LEFT JOIN ps_product_attribute_image pai on(pa.id_product_attribute = pai.id_product_attribute)
WHERE pl.id_lang = 1
AND pal.id_lang = 1
GROUP BY pa.reference
ORDER BY p.id_product, pac.id_attribute