Solved

Auto Increment Field in a Query

Posted on 2007-03-21
3
581 Views
Last Modified: 2008-01-09
I want to have a new field in the results of an access query that auto increments (1,2,3...).  Is this possible?  Thanks!
0
Comment
Question by:erichranz
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 50

Accepted Solution

by:
Gustav Brock earned 125 total points
ID: 18764635
Yes, use a function like this where the field ID is your primary or at least unique key:

Public Function RowCounter( _
  ByVal strKey As String, _
  ByVal booReset As Boolean) _
  As Long
 
' Builds consecutive RowIDs in select, append or create query
' with the possibility of automatic reset.
'
' Usage (typical select query):
'   SELECT RowCounter(CStr([ID]),False) AS RowID, *
'   FROM tblSomeTable
'   WHERE (RowCounter(CStr([ID]),False) <> RowCounter("",True));
'
' The Where statement resets the counter when the query is run
' and is needed for browsing a select query.
'
' Usage (typical append query, manual reset):
' 1. Reset counter manually:
'   Call RowCounter(vbNullString, False)
' 2. Run query:
'   INSERT INTO tblTemp ( RowID )
'   SELECT RowCounter(CStr([ID]),False) AS RowID, *
'   FROM tblSomeTable;
'
' Usage (typical append query, automatic reset):
'   INSERT INTO tblTemp ( RowID )
'   SELECT RowCounter(CStr([ID]),False) AS RowID, *
'   FROM tblSomeTable
'   WHERE (RowCounter("",True)=0);
'
' 2002-04-13. Cactus Data ApS. CPH
' 2002-09-09. Str() sometimes fails. Replaced with CStr().
' 2005-10-21. Str(col.Count + 1) reduced to col.Count + 1.

  Static col As New Collection
 
  On Error GoTo Err_RowCounter
 
  If booReset = True Then
    Set col = Nothing
  Else
    col.Add col.Count + 1, strKey
  End If
 
  RowCounter = col(strKey)
 
Exit_RowCounter:
  Exit Function
 
Err_RowCounter:
  Select Case Err
    Case 457
      ' Key is present.
      Resume Next
    Case Else
      ' Some other error.
      Resume Exit_RowCounter
  End Select

End Function

/gustav
0
 
LVL 4

Author Comment

by:erichranz
ID: 18800702
Thank you, sir!
0
 
LVL 50

Expert Comment

by:Gustav Brock
ID: 18800730
You are welcome!

/gustav
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

You need to know the location of the Office templates folder, so that when you create new templates, they are saved to that location, and thus are available for selection when creating new documents.  The steps to find the Templates folder path are …
The Windows Phone Theme Colours is a tight, powerful, and well balanced palette. This tiny Access application makes it a snap to select and pick a value. And it doubles as an intro to implementing WithEvents, one of Access' hidden gems.
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…
In Microsoft Access, learn how to use Dlookup and other domain aggregate functions and one method of specifying a string value within a string. Specify the first argument, which is the expression to be returned: Specify the second argument, which …

737 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question