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[英]how to convert query related to calculate work hours in MySQL to MS Access
[英]MS Access Query Calculate Field
當您沒有賣出數量時,您的總和將有效地變成“購買為零”,這將導致沒有答案。
您應該使用[Purchased]-(Nz([Sold],0))允許為空,這將強制零進入計算。
我進入SQL視圖並將INNER JOIN更改為RIGHT JOIN,它完成了工作。
SELECT tblProduct.Product_ID, tblProduct.ProductName, Nz([Purchased],0) AS PurchasedQuantity, Nz([Sold],0) AS SoldQuantity, [PurchasedQuantity]-(Nz([SoldQuantity],0)) AS [Available] FROM qrySoldProducts RIGHT JOIN (qryPurchasedProducts RIGHT JOIN tblProduct ON qryPurchasedProducts.Product_ID = tblProduct.Product_ID) ON qrySoldProducts.Product_ID = tblProduct.Product_ID;
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