Question

尝试从3个不同的表中检索列，其中TurnTime是来自第4个表的DATEDIFF

CustomerName, OrderTypeName, LoanNumber, TurnTime1, TurnTime2,TurnTime3, TurnTime4

表：

tblCustomer, tblOrderType, tblOrder, tblOrderActivity, tblActivity

我在放置DATEDIFF时遇到语法错误。我认为我做错了，并试图在时间上有所不同。

下表用于DATEDIFF的tblOrderActivity

tblActivity      ActivityID                ActivityName
                      1                      Received
                      2                       Keyed
                      3                      Printed
                      4                      Delivered

我想从1-2,2-3,3-4,1-4找到DATEDIFF。 ActivityID和ActivityDate位于tbl.OrderActivity

我试图将(Select DATEDIFF与我希望从中检索日期的表INNERJOIN放在一起，但是，它也导致了语法错误。这是我目前的代码：

SELECT   
dbo.tblCustomer.CustomerName, dbo.tblOrderType.OrderTypeName, dbo.tblOrder.LoanNumber, 
dbo.tblOrderActivity.ActivityDate, 
DATEDIFF(MINUTE, ActivityID=1, ActivityID=2) AS TurnTime1, 
DATEDIFF(MINUTE, ActivityID=2, ActivityID=3) AS TurnTime2,
DATEDIFF(MINUTE, ActivityID=3, ActivityID=4) AS TurnTime3,
DATEDIFF(MINUTE, ActivityID=1, ActivityID=4) AS TurnTime4
FROM     
dbo.tblOrder 
INNER JOIN
    dbo.tblCustomer ON dbo.tblOrder.CustomerID = dbo.tblCustomer.CustomerID 
INNER JOIN
    dbo.tblOrderActivity ON dbo.tblOrder.OrderID = dbo.tblOrderActivity.OrderID AND 
    dbo.tblOrder.OrderID = dbo.tblOrderActivity.OrderID 
INNER JOIN
    dbo.tblActivity ON dbo.tblOrderActivity.ActivityID = dbo.tblActivity.ActivityID 
INNER JOIN
    dbo.tblOrderType ON dbo.tblOrder.OrderTypeID = dbo.tblOrderType.OrderTypeID


ORDER BY dbo.tblCustomer.CustomerName, dbo.tblOrderType.OrderTypeName, dbo.tblOrder.LoanNumber

Answer 1

这样的东西？

SELECT   
dbo.tblCustomer.CustomerName, dbo.tblOrderType.OrderTypeName, dbo.tblOrder.LoanNumber, 
a1.ActivityDate, 
DATEDIFF(MINUTE, a1.ActivityDate, a2.ActivityDate) AS TurnTime1, 
DATEDIFF(MINUTE, a2.ActivityDate, a3.ActivityDate) AS TurnTime2,
DATEDIFF(MINUTE, a3.ActivityDate, a4.ActivityDate) AS TurnTime3,
DATEDIFF(MINUTE, a1.ActivityDate, a4.ActivityDate) AS TurnTime4
FROM     
dbo.tblOrder 
INNER JOIN
    dbo.tblCustomer ON dbo.tblOrder.CustomerID = dbo.tblCustomer.CustomerID 
INNER JOIN
    dbo.tblOrderActivity a1 ON dbo.tblOrder.OrderID = a1.OrderID and a1.activityid = 1
INNER JOIN
    dbo.tblOrderActivity a2 ON dbo.tblOrder.OrderID = a2.OrderID and a1.activityid = 2
INNER JOIN
    dbo.tblOrderActivity a3 ON dbo.tblOrder.OrderID = a3.OrderID and a1.activityid = 3
INNER JOIN
    dbo.tblOrderActivity a4 ON dbo.tblOrder.OrderID = a4.OrderID and a1.activityid = 4
INNER JOIN
    dbo.tblOrderType ON dbo.tblOrder.OrderTypeID = dbo.tblOrderType.OrderTypeID
ORDER BY dbo.tblCustomer.CustomerName, dbo.tblOrderType.OrderTypeName, dbo.tblOrder.LoanNumber

Ketil

Answer 2

感谢您在最终代码Ketil中的帮助。这是我的问题的完整功能和工作解决方案。

SELECT   
dbo.tblCustomer.CustomerName, dbo.tblOrderType.OrderTypeName, dbo.tblOrder.LoanNumber, 
DATEDIFF(MINUTE, a1.ActivityDate, a2.ActivityDate) AS [TurnTime1], 
DATEDIFF(MINUTE, a2.ActivityDate, a3.ActivityDate) AS [TurnTime2],
DATEDIFF(MINUTE, a3.ActivityDate, a4.ActivityDate) AS [TurnTime3],
DATEDIFF(MINUTE, a1.ActivityDate, a4.ActivityDate) AS [TurnTime4]
FROM     
dbo.tblOrder 
LEFT OUTER JOIN
dbo.tblCustomer ON dbo.tblOrder.CustomerID = dbo.tblCustomer.CustomerID 
LEFT OUTER JOIN
dbo.tblOrderActivity a1 ON dbo.tblOrder.OrderID = a1.OrderID and a1.ActivityID = 1
LEFT OUTER JOIN
dbo.tblOrderActivity a2 ON dbo.tblOrder.OrderID = a2.OrderID and a2.ActivityID = 2
LEFT OUTER JOIN
dbo.tblOrderActivity a3 ON dbo.tblOrder.OrderID = a3.OrderID and a3.ActivityID = 3
LEFT OUTER JOIN
dbo.tblOrderActivity a4 ON dbo.tblOrder.OrderID = a4.OrderID and a4.ActivityID = 4
INNER JOIN
dbo.tblOrderType ON dbo.tblOrder.OrderTypeID = dbo.tblOrderType.OrderTypeID
ORDER BY dbo.tblCustomer.CustomerName, dbo.tblOrderType.OrderTypeName, dbo.tblOrder.LoanNumber, a1.ActivityDate;

SQL：在几分钟内返回多个表和DATEDIFF的列

2 个答案: