How find last date in a query

This would be a simple solution IF the table I'm working with had been designed differently.  But here goes...
I have a query that gets data from a table that has fileds named "Date 1", "Drop 1 Billed", "Date 2", "Drop 2 Billed", "Date 3", "Drop 3 Billed", "Date 4", "Drop 4 Billed", "Date 5", "Drop 5 Billed", and "Date 6", "Drop 6 Billed".  I've attached a screen grab of the resulting query so you can see what I'm talking about.  I need to add a field to this query to show the last date where the associated "billed" date is true.  In other words, using the attached example, in the last column of my query I want 7/21/2010 to be the result because 8/5/2010 is not true yet.
What would be syntax be for this last column?
SteveL13Asked:
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Dale FyeOwner, Dev-Soln LLCCommented:
you forgot the screen shot
dqmqCommented:
Screen shot and existing qyery please.
Dale FyeOwner, Dev-Soln LLCCommented:
You are either going to need a function or a union query.  My guess is that the function will be the way to go.

Public Function fnLastBilledDate(Paramarray arBilling() as Variant) as Date

    Dim intLoop as integer
    Dim dtLast as date

    For intLoop = lbound(arBilling) to Ubound(arBilling) Step 2
        if arBilling(intLoop + 1) = False Then
            fnLastBilledDate = dtLast
            Exit Function
        else
            dtLast = arBilling(intLoop)
        endif
    Next

End Function

Then, in your query you would call this:

SELECT field1, field2, fnLastBilledDate([Date 1], [Drop 1 Billed], [Date 2], [Drop 2 Billed], [Date 3], [Drop 3 Billed], ...) as LastBilledDate
FROM yourTable

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mcv22Commented:
SELECT MAX(a.MaxDate)
FROM
(
select max("Date 1") as MaxDate from table_name where "Drop 1 Billed" = 1
union
select max("Date 2") as MaxDate from table_name where "Drop 2 Billed" = 1
union
select max("Date 3") as MaxDate from table_name where "Drop 3 Billed" = 1
union
select max("Date 4") as MaxDate from table_name where "Drop 4 Billed" = 1
union
select max("Date 5") as MaxDate from table_name where "Drop 5 Billed" = 1
union
select max("Date 6") as MaxDate from table_name where "Drop 6 Billed" = 1
) AS a
SteveL13Author Commented:
I did forget the screen shot.  Here it is.

DateExample.jpg
SteveL13Author Commented:
Here is my SQL code so far without the last column.  What do I need to do to it to include the last column?

SELECT tblProject.LogicJobN, tblProject.Date1, tblProject.Drop1Billed, tblProject.Date2, tblProject.Drop2Billed, tblProject.Date3, tblProject.Drop3Billed, tblProject.Date4, tblProject.Drop4Billed, tblProject.Date5, tblProject.Drop5Billed, tblProject.Date6, tblProject.Drop6Billed
FROM tblProject;
Patrick MatthewsCommented:
If we can assume the following:1) The dates always increase as we move to the "next" drop number, and2) There is never an instance where Drop[N]Billed is true but Drop[N-1]Billed is false...SELECT tblProject.LogicJobN, tblProject.Date1, tblProject.Drop1Billed, tblProject.Date2, tblProject.Drop2Billed, tblProject.Date3, tblProject.Drop3Billed, tblProject.Date4, tblProject.Drop4Billed, tblProject.Date5, tblProject.Drop5Billed, tblProject.Date6, tblProject.Drop6Billed,Switch(Drop6Billed, Date6, Drop5Billed, Date5, Drop4Billed, Date4, Drop3Billed, Date3, Drop2Billed, Date2, Drop1Billed, Date1, True, Null) AS LastDateFROM tblProjectNote that returns a Null for "none of the above"--is that what you would want?

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8080_DiverCommented:
I think you can do it with a CASE.

SELECT CASE WHEN "Drop 6 Billed" = -1 Then "Date 6"
WHEN "Drop 5 Billed" = -1 Then "Date 5"
WHEN "Drop 4 Billed" = -1 Then "Date 4"
WHEN "Drop 3 Billed" = -1 Then "Date 3"
WHEN "Drop 2 Billed" = -1 Then "Date 2"
WHEN "Drop 1 Billed" = -1 Then "Date 1"
ELSE NULL
END AS SelectedDate
Patrick MatthewsCommented:
8080_Diver,This is Access :)Patrick
8080_DiverCommented:
Sorry, forgot Access has limitations (although, I thought I had used a CASE in Access before).
I have provided the equivalent ACCESS IIF statement.

 

IIF(("Drop 6 Billed" = -1), "Date 6",
     IIF("Drop 5 Billed" = -1), "Date 5", 
         IIF(("Drop 4 Billed" = -1), "Date 4", 
              IIF("Drop 3 Billed" = -1), "Date 3",
                  IIF(("Drop 2 Billed" = -1), "Date 2",
                       IIF(("Drop 1 Billed" = -1), "Date 1",NULL)
                 )
            )
        )
     )

Open in new window

Patrick MatthewsCommented:
>>although, I thought I had used a CASE in Access beforeVBA has a Select Case logical structure, so you may have been thinking about that :)
8080_DiverCommented:
Indeed, I had gone back and looked at the database/app I was thinking of and that is exactly what I used.
I tend to only prototype in Access and then I switch to SQL Server and, even if I keep the Access front end, I use a SQL Server backend (and a lot fo stored procs ;-).
Dale FyeOwner, Dev-Soln LLCCommented:
I gave you the answer in my first post, but I like MatthewsPatrick's use of Switch even better, since Switch is already optimized to do exactly what the function I gave you would do.
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