row_number分區結果錯誤

Question

我正在使用ROW_NUMBER按銷售描述對國家/地區進行排名。 查詢如下

SELECT country, SUM(sales) AS sales,
       ROW_NUMBER() OVER (PARTITION BY country ORDER BY SUM(sales) DESC) AS 'rank'
FROM table
GROUP BY country
ORDER BY sales DESC

由於某種原因，該排名在所有國家中都排名第一。

Answer 1

如果按COUNTRY分區，則row_number重置為1

SELECT country, 
       SUM(sales) AS sales, 
       ROW_NUMBER() OVER (ORDER BY SUM(sales) DESC) AS 'rank'
FROM table
GROUP BY country
ORDER BY sales DESC