使用 GROUP BY 和聚合函数的多个 INNER JOIN

Question

我带着另一个问题回来了。我已经修补了 1 天半，但仍然没有运气。所以我有下面的表格。

Table1
Field1 Field2 Field3 Field4     Field5
DR1    500    ID1    Active     TR1
DR2    250    ID2    Active     TR1
DR3    100    ID1    Active     TR1
DR4    50     ID3    Active     TR1
DR5    50     ID1    Cancelled  TR1
DR6    150    ID1    Active     TR2

Table2
Field1 Field3
ID1    Chris
ID2    John
ID3    Jane

Table3
Field1 Field2
TR1    Shipped  
TR2    Pending

我目前可以达到这个效果。

Name   Total
Chris  650    3
John   250    1
Jane   50     1

使用这条sql语句

SELECT t2.Field3 as Name , SUM(t1.Field2) as Total
 FROM [Table1] t1 INNER JOIN [Table2] t2 ON t1.Field3 = t2.Field1
  GROUP BY t2.Field3

但是，我想实现如下所示的结果。

Chris 600 2
John  250 1
Jane  50  1

我想先检查表 3，如果它有一个“已发货”字段 2，然后它包括表 1 中的所有内容和“活动”字段 4。它不应包括“已取消”字段 4。如果 Table3 有一个 Pending 的 Field2，它也不应该包含它。我会很感激任何一点帮助。谢谢。

Answer 1

好吧，你只需要连接所有需要在 where 子句中包含所需字段的表。

并添加一个where 子句。

SELECT t2.Field3,
       SUM(t1.Field2) as CTotal,
       count(*) as NbItems
FROM Table1 t1 

INNER JOIN Table2 t2
       ON t1.Field3 = t2.Field1
--add a join on Table3
INNER JOIN Table3 t3 
       ON t3.Field1 = t1.Field5 
--add your where clause
WHERE t1.Field4 = 'Active'
AND t3.Field2 <> 'Pending'
GROUP BY t2.Field3
--ORDER BY CTotal DESC

见SqlFiddle

编辑

针对你的问题

SELCT custInfo.CName, 
Count(*) as TransactionCount, 
SUM(CTotal) as TransactionTotal 
FROM (TamarawTransaction trans 
INNER JOIN TamarawCustomerInformation custInfo 
    ON trans.CCustomerCode=custInfo.CCustomerCode) 
INNER JOIN TamarawTrip  trip
    ON trans.CTrip=trip.CTrip 

Where trip.CStatus='Finalized' 
AND trans.CStatus='Active' 
GROUP BY custInfo.CName

使用“奇怪的访问连接语法”

SELECT TamarawCustomerInformation.CName, 
Count(*) AS TransactionCount, 
SUM(CTotal) AS TransactionTotal
FROM TamarawCustomerInformationn 
INNER JOIN (TamarawTrip INNER JOIN TamarawTransaction ON TamarawTrip.CTrip=TamarawTransaction.CTrip) 
          ON TamarawCustomerInformationn.CCustomerCode=TamarawTransaction.CCustomerCode
WHERE TamarawTrip.CStatus='" & "Shipped" & "' and TamarawTransaction.CStatus='" & "Active" & "'
GROUP BY TamarawCustomerInformation.CName;