SQL Server減去特定百分比

Question

我試圖將一定比例的價格減去一個AS柱。

SELECT TOP 2 *, price - (price * (discount/100)) AS discountedPrice 
FROM products 
WHERE discount != 0 

但這似乎不起作用。我做錯了什麼？

我希望它這樣的，我們說的價格是500和折扣爲20。然後，它必須要減去那些20的500

所以500％ - 20％，只是在SQL Server格式。

Answer 1

你除以整數：20/100是0，而不是0.2

嘗試通過100.0

SELECT TOP 2 
*, 
price - (price * (discount/100.0)) AS discountedPrice 
FROM products 
WHERE discount != 0 

製作師如果你想在折扣價是int ...

SELECT TOP 2 *, 
CONVERT(int, price - (price * (discount/100.0))) AS discountedPrice 
FROM products 
WHERE discount != 0 

Answer 2

參考：Link

SELECT TOP 2 *, price - (price * (discount/100.0)) AS discountedPrice FROM 
products WHERE discount != 0 

Answer 3

我假設折扣是一個整數，那麼你應該預先將一個1.0轉換爲一個浮點數。

price - (price * (1.0 discount/100))