mysql - 使用当前记录加上另一个表记录的总和从一个表更新记录

Question

我试图用不同表中两条记录的总和来更新我表中的一条记录。到目前为止，我已经有了这个，但它似乎没有用。

    UPDATE StockCatalog
    SET StockCatalog.ProductQuantity = (StockCatalog.ProductQuantity + DeliveryContent.DeliveryQuantity)
    FROM StockCatalog
    INNER JOIN DeliveryContent on StockCatalog.StockID = DeliveryContent.StockID

任何帮助将不胜感激。谢谢

Answer 1

试试这个:

 UPDATE StockCatalog
 INNER JOIN DeliveryContent on StockCatalog.StockID = DeliveryContent.StockID
 SET StockCatalog.ProductQuantity = (StockCatalog.ProductQuantity +  DeliveryContent.DeliveryQuantity)