如何在查询中间的列上执行非重复

Question

我正在尝试（在国家/地区）列上执行（区别）或其他任何操作相同的操作，但是这不起作用，这就是我遇到的问题

ListenableWorker

Answer 1

WITH t1 AS 
(
    SELECT c.Country, SUM(i.Total) TotalSpent, c.FirstName, c.LastName, c.CustomerId
    FROM 
        Customer c
        JOIN Invoice i ON c.CustomerId = i.CustomerId
    GROUP BY c.CustomerId
)

SELECT t1.*
FROM t1
JOIN(
    SELECT Country, MAX(TotalSpent) AS MaxTotalSpent, FirstName, LastName, CustomerId
    FROM t1
    GROUP BY Country
)t2
ON t1.Country = t2.Country
WHERE t1.TotalSpent = t2.MaxTotalSpent
ORDER BY Country;