想要对价格超过10美元的产品申请50％的折扣

Question

表名是Products，我想对Products表中每个价格超过10美元的条目的价格应用50％的折扣。

https://www.w3schools.com/sql/trysql.asp?filename=trysql_select_all

Answer 1

这应该这样做

Update products set  price  = price/2     where price >10;

Answer 2

SELECT ProductId,
ProductName,
SupplierID,
CategoryID,
Unit,
CASE WHEN Price > 10 THEN PRICE * 0.5
ELSE PRICE
END AS PRICE
FROM Products;