sql - 退回当月没有销售的产品

Question

我如何返回一个月没有销售的记录，例如 2004 年 7 月？

用户将提供一个日期，比如 2004 年 7 月，然后我需要查看没有销售的产品。

SELECT 

 DP.ProductID
,DP.Name
,FS.OrderDate
,FS.OrderQty
,FS.OrderAmount

FROM dbo.DimProduct AS DP

LEFT JOIN dbo.FactSales as FS on FS.ProductID = DP.ProductID

Answer 1

SELECT  DP.*
FROM    dbo.DimProduct AS DP
        LEFT JOIN dbo.FactSales as FS 
            ON  FS.ProductID = DP.ProductID AND
                DATENAME(month, FS.OrderDate) = 'July' AND
                YEAR(FS.OrderDate) = 2004
WHERE   FS.ProductID IS NULL

Answer 2

也许这可以解决您的问题：

SELECT 

 DP.ProductID
,DP.Name
,FS.OrderDate
,FS.OrderQty
,FS.OrderAmount

FROM dbo.DimProduct AS DP
LEFT JOIN dbo.FactSales as FS on FS.ProductID = DP.ProductID 

WHERE FS.OrderAmount == 0

Answer 3

SELECT  DP.*
FROM    dbo.DimProduct AS DP
WHERE   NOT EXISTS ( SELECT 1
                     FROM   dbo.FactSales AS FS
                     WHERE  FS.ProductID = DP.ProductID
                            AND DATENAME(month, FS.OrderDate) = 'July'
                            AND YEAR(FS.OrderDate) = 2004 )