mysql | mysql |具体要求

Question

我有 mysql 列:

[{"name":"Color","value":"Red (+5$)","price":"+5"}] // options column

并请求:

SELECT C.options, C.qty, P.PRICE
FROM `cart` C
LEFT JOIN `products` P ON C.productid = P.id
WHERE C.userid = '3c9494e7ff22e2a7ac01a3e95fbbc0e4'

但我需要这个:

SELECT C.options, C.qty, (P.PRICE + (substract price +5 from options column))*C.qty
FROM `cart` C
LEFT JOIN `products` P ON C.productid = P.id
WHERE C.userid = '3c9494e7ff22e2a7ac01a3e95fbbc0e4'

上面的请求可以得到吗？ 谢谢。

Answer 1

我假设您想总结这些值

尝试一下

SELECT C.options, C.qty, SUM(P.PRICE + c.options) * C.qty
FROM `cart` C
LEFT JOIN `products` P ON C.productid = P.id
WHERE C.userid = '3c9494e7ff22e2a7ac01a3e95fbbc0e4'
GROUP BY c.options,c.qty

如果您需要转换选项列，请这样做

SELECT C.options, C.qty, SUM(P.PRICE + CAST(c.options AS DECIMAL)) * C.qty
FROM `cart` C
LEFT JOIN `products` P ON C.productid = P.id
WHERE C.userid = '3c9494e7ff22e2a7ac01a3e95fbbc0e4'
GROUP BY c.options,c.qty