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Requete update table `ps_stock_available`

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j'essaye de mettre à jour les quantités de ma table "`ps_stock_available`" à partir d'une autre table copie, 

en comparant les champs id_product, quantity et id_product_attribute


voici ma requete, pourriez-vous m'aider à la réécrire.

UPDATE `ps_stock_available` SET `quantity`= (SELECT ps_stock_available.`id_product`, ps_stock_available.`id_product_attribute`, ps_stock_available.`quantity`, ps_stock_available2.`id_product`, ps_stock_available2.`quantity`,ps_stock_available2.`id_product_attribute` FROM `ps_stock_available`, `ps_stock_available2` WHERE ps_stock_available.`id_product`= ps_stock_available2.`id_product`)  where ps_stock_available.`id_product`> 0


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