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Access Query to Get Values

Posted on 2014-07-30
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Last Modified: 2014-07-30
I have an old access 97 database that has multiple fields per record.

Client1_EntryDate
Client2_EntryDate
Client3_EntryDate
Earliest_EntryDate

I want to run a query that can look at the 3 columns, Client1_EntryDate, Client2_EntryDate and Client3_EntryDate then get me the earliest date out of the 3 so that I can update it into the field Earliest_EntryDate field.

so for eg,  if Record 1 had

Client1_EntryDate = 12/07/2001
Client2_EntryDate = 18/01/1998
Client3_EntryDate = 15/03/2005

then I want to update Record1 Earliest_EntryDate with the value of 18/01/1998

This is 1 query that will give me the earliest values. Then I will also want to run a similar query that updates another field but gives me the latest.

Client1_LastDate
Client2_LastDate
Client3_LastDate
Latest_EntryDate

This will opposed to looking at the earliest date will update the record with the latest date.
We are only looking within the record as all fields required to lookup reside within a record.  Please also note that its possible some values will be null which is that case the value will be ignored.

Eg

Client1_EntryDate = 12/07/2001
Client2_EntryDate =  Blank
Client3_EntryDate = 15/03/2005

then I want to update Earliest_EntryDate with the value of 12/07/2001
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Question by:GenieMaster
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3 Comments
 
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Accepted Solution

by:
Dale Fye earned 2000 total points
ID: 40229574
I use a function for this.  It accepts as many parameters of whatever type you want to compare and will return the minimum value within that set:

What you should be able to do is:

Update yourTable Set Earliest_Entry = fnMin([Client1_EntryDate], [Client2_EntryDate], [Client3_EntryDate])

you might want to add:

WHERE [Earliest_Entry] IS NULL

Public Function fnMin(ParamArray ValList() As Variant) As Variant

   Dim intLoop As Integer
   Dim myVal As Variant
   
   For intLoop = LBound(ValList) To UBound(ValList)
      If Not IsNull(ValList(intLoop)) Then
         If IsEmpty(myVal) Then
            myVal = ValList(intLoop)
         ElseIf ValList(intLoop) < myVal Then
            myVal = ValList(intLoop)
         End If
      End If
   Next
   fnMin = myVal
   
End Function

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Author Closing Comment

by:GenieMaster
ID: 40229782
Perfect, Just what I needed. Thanks :)
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LVL 48

Expert Comment

by:Dale Fye
ID: 40230193
Glad to help.

BTW, really easy to modify that to give you the Max values.
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