如何将未售出商品的周数作为零值添加到我的 SQL 查询中？

Question

基本上我在下面有这个查询，它给出了每周的销售数量，但它跳过了特定商品没有销售的那几周。我还希望将它们显示为 0 值。顺便问一下，是否可以合并下面的两个查询？我试过了，但无法使连接起作用。

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 - 销售额：

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;

谢谢你和最诚挚的问候，

弗朗西斯科

Answer 1

您要做的第一件事是在模型名称和星期之间创建笛卡尔连接。类似于：

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

这将为每个模型名称每周创建一条记录。

然后，您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

下面的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;

如何将未售出商品的周数作为零值添加到我的 SQL 查询中？

How to add the weeks with no items sold as zero values to my SQL query?

sql

ms-access

ms-access-2013