Serialize using Subquery

Posted on 2010-09-14
Last Modified: 2013-11-28
Hi experts,

Up till now I've been using Lebans Serialize function to add sequential numbers to my query.
For a particular query it was very slow, so I decided to take a different path. I use a subquery, & in the form it works fine...much quicker than the serialize function.
The trouble is when I try and view the query Access blows up/Closes message.
Any ideas why it should work in a form, but not able to view it.
I can also view it in design mode.

Attached please find the query..It's based on many others..I can't post them all.

I'm using Access 2003 SP3 + latest hotfixes

SELECT o1.ContactID, (SELECT COUNT(contactid) FROM QryPreSubTotalFacility AS o2 WHERE o2.DueDate <=O1.DueDate) AS InstNo, o1.DueDate

FROM QryPreSubTotalFacility AS o1;

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Question by:tbsgadi
  • 4
  • 2
LVL 46

Author Comment

ID: 33672033
BTW the same happens in Access 2007
LVL 119

Expert Comment

by:Rey Obrero
ID: 33672688
1. convert the query QryPreSubTotalFacility to a make table query (this is just a test)
   * run a query with the count(*) subquery using the created table, see if you still get the problem

2. can you post the SQL of query QryPreSubTotalFacility
LVL 49

Accepted Solution

Gustav Brock earned 500 total points
ID: 33679624
Here is a very fast method using a Collection.
The in-line comments explain typical usage.

Public Function RowCounter( _

  ByVal strKey As String, _

  ByVal booReset As Boolean, _

  Optional ByVal strGroupKey As String) _

  As Long


' Builds consecutive RowIDs in select, append or create query

' with the possibility of automatic reset.

' Optionally a grouping key can be passed to reset the row count

' for every group key.


' 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.

' 2008-02-27. Optional group parameter added.

  Static col      As New Collection

  Static strGroup As String


  On Error GoTo Err_RowCounter


  If booReset = True Or strGroup <> strGroupKey Then

    Set col = Nothing

    strGroup = strGroupKey


    col.Add col.Count + 1, strKey

  End If


  RowCounter = col(strKey)



  Exit Function



  Select Case Err

    Case 457

      ' Key is present.

      Resume Next

    Case Else

      ' Some other error.

      Resume Exit_RowCounter

  End Select

End Function

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LVL 46

Author Comment

ID: 33680081
Cap I tried the temp Table & of course it worked fine.
The question still remains why does a query work within a form but doesn't display?
LVL 46

Author Closing Comment

ID: 33680092
I've come across this code before, but never tried it,assuming (wrongly) that it wouldn't be any quicker than Serialize.
LVL 49

Expert Comment

by:Gustav Brock
ID: 33680254
You are welcome!

LVL 46

Author Comment

ID: 33691324
FYI I've managed to make the original query needed to have ORDER BY o1.DueDate ;

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