Question

我正在尝试从两个表ng serve -o和SaleInvoices中获取数据。两者都与外键Customers链接。我试图让客户重复记录计数并将其分组。但是它会产生以下错误。

CustomerId

我遇到的错误是

选择列表中的'SaleInvoices.InvoiceID'列无效，因为它不包含在汇总函数或 GROUP BY子句。

Answer 1

具有SELECT中所有列分组的版本：

Select SaleInvoices.InvoiceID
      ,SaleInvoices.CustomerID
      ,Customers.ContactName
      ,Customers.CNIC
      ,Customers.City
      ,Customers.CellNumber
      ,Customers.CompanyName
      ,Count(*)
 From SaleInvoices 
 INNER JOIN Customers 
 ON SaleInvoices.CustomerID=Customers.CustomerId 
 Where SaleInvoices.UpdatedDate >= '2017-01-02 16:53:53.253' 
 AND SaleInvoices.UpdatedDate<= '2019-01-02 16:53:53.253' 
 GROUP BY SaleInvoices.InvoiceID
      ,SaleInvoices.CustomerID
      ,Customers.ContactName
      ,Customers.CNIC
      ,Customers.City
      ,Customers.CellNumber
      ,Customers.CompanyName

从选择中删除列的版本，而无需更改组，方法是：

Select Customers.ContactName
      ,Count(*)
 From SaleInvoices 
 INNER JOIN Customers 
 ON SaleInvoices.CustomerID=Customers.CustomerId 
 Where SaleInvoices.UpdatedDate >= '2017-01-02 16:53:53.253' 
 AND SaleInvoices.UpdatedDate<= '2019-01-02 16:53:53.253' 
 GROUP BY Customers.ContactName

另一种方法是在选择的所有列上使用诸如MIN（），MAX（）等聚合函数：

Select MIN(SaleInvoices.InvoiceID)
      ,MIN(SaleInvoices.CustomerID)
      ,Customers.ContactName
      ,MIN(Customers.CNIC)
      ,MIN(Customers.City)
      ,MIN(Customers.CellNumber)
      ,MIN(Customers.CompanyName)
      ,Count(*)
 From SaleInvoices 
 INNER JOIN Customers 
 ON SaleInvoices.CustomerID=Customers.CustomerId 
 Where SaleInvoices.UpdatedDate >= '2017-01-02 16:53:53.253' 
 AND SaleInvoices.UpdatedDate<= '2019-01-02 16:53:53.253' 
 GROUP BY Customers.ContactName

Answer 2

您正在按Customers.ContactName对结果集的输出进行分组，因此，只能在Customers.ContactName中包含select。
您有两种选择：

1）汇总您在select中放入的所有列。
2）或者让他们所有人都参加了group by子句。

使用join从两个表中获取数据并执行Count和GroupBy

2 个答案: