MYSQL ROUND＆amp; SELECT查询

Question

我有一个查询...

ROUND(100 - (OnSale) / (WholeSalePrice) * 100) AS DiscountIS

OnSale = 15，WholeSalePrice = 20 结果：DiscountIS = 25

这给了我OnSale价格偏离WholeSalePrice的百分比。

但如果OnSale价格为0，则显示100为DiscountIS的值。如果我想让它作为DiscountIS返回0，那么正确的查询是什么？

Answer 1

试试这个：

Select CASE 
             When OnSale = 0 Then 0 
       ELSE 
             ROUND(100 - (OnSale) / (WholeSalePrice) * 100)
       END
       AS DiscountIS