我的月表的結果有重複的DISTINCT不會爲我工作

Question

查詢：

SELECT 
    MONTH(orderdate) AS [Month], COUNT(orderid) AS [Number of Orders] 
FROM 
    Sales.Orders 
WHERE 
    YEAR(orderdate) = 2007 
GROUP BY 
    orderdate; 

Answer 1

你GROUP BY說法是錯誤的。

你應該「GROUP BY MONTH（訂購日期）」