如何将没有作为零值销售的项目的周添加到我的SQL查询中？

Question

基本上我在下面有这个查询，它给我每周的销售数量，但是它会跳过没有特定商品销售的周数。我希望它也显示为0值。 顺便说一句，是否有可能合并下面的两个查询？我尝试过但无法使用连接。

SELECT tblWeek.WeekNum, [Query - Sales].ModelName, Count([Query - Sales].OutDate) AS CountOfOutDate
FROM tblWeek LEFT JOIN [Query - Sales] ON tblWeek.WeekNum = [Query - Sales].WeekNumber
GROUP BY tblWeek.WeekNum, [Query - Sales].ModelName
HAVING ((([Query - Sales].ModelName) Is Not Null))
 ORDER BY [Query - Sales].ModelName;

查询 - 销售：

SELECT DDL_Items.ModelName, DDL_Items.OutDate, DDL_Models.Type, DatePart("ww",[OutDate],2) AS WeekNumber
FROM DDL_Models INNER JOIN DDL_Items ON DDL_Models.ModelName = DDL_Items.ModelName;

谢谢你，最诚挚的问候，

旧金山

Answer 1

您要做的第一件事是在您的模型名称和周之间创建一个笛卡尔联接。类似的东西：

SELECT DISTINCT [Query - Sales].ModelName, tblWeek.WeekNum
FROM [Query - Sales]
LEFT JOIN tblWeek 

这将为每个型号名称每周创建一条记录。

然后，您想要将实际数据加入此查询：

SELECT qryA.*, Count([Query - Sales].OutDate) AS CountOfOutDate
FROM (
SELECT DISTINCT [Query - Sales].ModelName, tblWeek.WeekNum
FROM [Query - Sales]
LEFT JOIN tblWeek 
) as qryA
LEFT JOIN [Query - Sales]   
   ON tblWeek.WeekNum = qryA.WeekNumber
GROUP BY tblWeek.WeekNum, qryA.ModelName
HAVING qryA.ModelName Is Not Null
ORDER BY qryA.ModelName;

Answer 2

以下完整代码，以防有人正在寻找答案：

SELECT qryA.ModelName, qryA.WeekNum, Count([Query - Sales].OutDate) AS CountOfOutDate
FROM qryA LEFT JOIN [Query - Sales] ON qryA.WeekNum = [Query - Sales].WeekNumber
GROUP BY qryA.ModelName, qryA.WeekNum;