最大和总和 mysql

Question

I've to get all the orders from one customer, then get the sum of the orders and then get the max order. I can't use order by and limit. I got the result but i can't get the make sum and max work properly

here is my current query:

SELECT SUM(Qty * UnitPrice) AS Total FROM `Details`
WHERE ONo IN (
    SELECT Orders.Ono
    FROM Orders, Customers
    WHERE Customers.FName = 'Charles' AND Customers.LName = 'Xavier' AND Customers.CNo = Orders.CNo
    GROUP BY Orders.ONo
)
GROUP BY ONo

Total
7.50
20.99
54.47
49.98
8.00

Answer 1

请尝试：

SELECT MAX(Total) as MaxTotal FROM (<your query comes here>) AS T