Question

如果该特定商品已被售出2次以上，我试图获取两件商品之间的时间间隔，然后我将如何在以后将其用于别名bybytime？

但我收到此错误：

列'sales.InvoiceDetailItem.DateTimeCreated'在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。消息8120，第16级，状态1，第4行在选择列表中，“ file.Item.DateTimeCreated”列无效，因为它既不包含在聚合函数中，也不包含在GROUP BY子句中。

    SELECT
  DATEDIFF(DAY,PS.[DateTimeCreated],P.[DateTimeCreated]) AS 'SoldTime'
, p.[Name]
, PS.[ItemCode]
, COUNT(*)
FROM
[ISTABLocalDB].[file].[Item] P
inner join [sales].[InvoiceDetailItem] PS on P.[LastInvoice_ID] = PS.Invoice_ID  
GROUP BY
    p.[Name], PS.[ItemCode]
HAVING 
    COUNT(*) >= 2
    order by p.[Name]

Answer 1

我想你想要这样的东西：

SELECT
  DATEDIFF(DAY,MIN(PS.[DateTimeCreated]),MAX(P.[DateTimeCreated])) AS 'SoldTime'
, p.[Name]
, PS.[ItemCode]
, COUNT(*)
FROM
[ISTABLocalDB].[file].[Item] P
inner join [sales].[InvoiceDetailItem] PS on P.[LastInvoice_ID] = PS.Invoice_ID  
GROUP BY
    p.[Name], PS.[ItemCode]
HAVING 
    COUNT(*) >= 2
    order by p.[Name];

Answer 2

您可以选择count（PS。[ItemCode]）为什么使用“ *”？

SELECT
  DATEDIFF(DAY,PS.[DateTimeCreated],P.[DateTimeCreated]) AS 'SoldTime'
, p.[Name]
, PS.[ItemCode]
, count( PS.[ItemCode]) 
FROM
[ISTABLocalDB].[file].[Item] P
inner join [sales].[InvoiceDetailItem] PS on P.[LastInvoice_ID] = PS.Invoice_ID  
GROUP BY
    p.[Name], PS.[ItemCode]
HAVING 
    count( PS.[ItemCode])  >= 2
    order by p.[Name]

如何将datediff与具有count的语句一起使用

2 个答案: