我的sql if else条件

Question

SELECT price, sale, (IF(sale > 0) THEN ((price-sale)/price)*100 ELSE sale) AS discount FROM tbl_business_service_price

需要帮助，当销售价格为0.00时，不要将百分比计算为100％

Answer 1

您已经混淆了if和case when语法，通常会看一下官方文档，您可以得到您想要的内容。

if解决方案：

SELECT 
    price, 
    sale, 
    IF(sale > 0, ((price - sale) / price) * 100, sale) AS discount 
FROM tbl_business_service_price

case when解决方案：

SELECT 
    price, 
    sale, 
    case when sale > 0 then ((price - sale) / price) * 100 else sale end AS discount 
FROM tbl_business_service_price

Answer 2

尝试一下..

SELECT price, sale, IF(sale > 0, (price-sale/price) * 100, sale) AS discount FROM tbl_business_service_price