SQL：在几分钟内返回多个表和DATEDIFF的列

试图从3个不同的表中检索列，TurnTime是第4个表中的DATEDIFF

客户名称、订单类型名称、贷款编号、周转时间1、周转时间2、周转时间3、周转时间4

表：

tbl客户、tblOrderType、tblOrder、tblOrderActivity、tblActivity

我在放置DateDiff时遇到语法错误。我认为我做得非常错误，并试图在时代中获得差异

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中找到DATEDIFF<代码>活动ID和

活动日期

在

tbl中。订单活动

我试图将一个

（选择DATEDIFF

与我希望从中检索日期的表的

INNERJOIN

放在一起，但是，它也导致语法错误。 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

像这样的

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

感谢您对Ketil最终代码的帮助。 这是我的问题的完整功能和有效的解决方案

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;

---

这似乎执行了，但没有返回任何列的行