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Sequentially number sub set query

Posted on 2013-02-05
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Last Modified: 2013-02-05
I have a POS system that has a table named "History" that logs information on each sale. It is not totally normalized. It has a [Transaction] field and a [product code] field. There can be 1 to many records with the same [Transaction]. I need to create a query that will create a number for each record that starts at 1 for each unique [transaction] value and increments for each additional record with the same transaction.

Example sample data:

Transaction         Product code
1                            bell
1                            swing
1                            food
2                            crickets
3                            food
3                            food

Desired Output:

Transaction         Product code      LineNum
1                            bell                        1
1                            swing                    2
1                            food                     3
2                            crickets                1
3                            food                     1
3                            food                     2

Is there a simple query that can do this?
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Question by:PetGuy
11 Comments
 
LVL 74

Expert Comment

by:Jeffrey Coachman
ID: 38855769
1. <It is not totally normalized. >
Then why not normalize it...?

2. Why do these two records have the same LineNum?:
2                            crickets                1
3                            food                     1

3. In a larger since this would be made easier to "manipulate" if you had defined primary key fields in your table...
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LVL 119

Expert Comment

by:Rey Obrero
ID: 38855836
try this query,

btw, do you have an autonumber id field?

select Transaction,[Product code], (select count(*) from History as H where H.Transaction=History.Transaction) as LineNum
from History
Order by History.transaction
0
 

Author Comment

by:PetGuy
ID: 38855852
1) The program I run is compiled code and i can not change it. I can only make fixes because I have back door access to the data.

2) the two records have the same linenum because they are different transactions. think of linenum as a subtable key embedded in a flat file.

3) that is essentially what i am creating
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LVL 49

Expert Comment

by:Gustav Brock
ID: 38855858
The function RowCounter is exactly for this and very fast too.
Study the in-line comments for typical usage.
Also not that parameters are strings. No problem for your product code but the ID may need to be wrapped as shown in CStr:

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));
'
' Usage (with group key):
'   SELECT RowCounter(CStr([ID]),False,CStr[GroupID])) 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.
' 2010-08-04. Corrected that group key missed first row in group.

  Static col      As New Collection
  Static strGroup As String
  
  On Error GoTo Err_RowCounter
  
  If booReset = True Then
    Set col = Nothing
  ElseIf strGroup <> strGroupKey Then
    Set col = Nothing
    strGroup = strGroupKey
    col.Add 1, strKey
  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

Open in new window

/gustav
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LVL 119

Accepted Solution

by:
Rey Obrero earned 500 total points
ID: 38855867
btw, do you have an autonumber id field?

select Transaction,[Product code], (select count(*) from History as H where H.Transaction=History.Transaction and H.id>=History.ID) as LineNum
from History
Order by History.transaction
0
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Author Comment

by:PetGuy
ID: 38855911
capricorn1

the query is giving me the count of number records each transaction has not an ordinal number.

results are like:
Transaction         Product code      LineNum
1                            bell                        3
1                            swing                    3
1                            food                    3
2                            crickets                1
3                            food                     2
3                            food                     2
0
 
LVL 119

Expert Comment

by:Rey Obrero
ID: 38855930
PetGuy,

did you see my last post?





.
0
 

Author Comment

by:PetGuy
ID: 38856030
capricorn1

History does not have an ID field
0
 
LVL 119

Expert Comment

by:Rey Obrero
ID: 38856043
too bad..

can you import the records to an access table, then create an autonumber field?
0
 

Author Comment

by:PetGuy
ID: 38856116
The table is in access. I can add fields without breaking the original program. I will add an auto id field.
0
 

Author Closing Comment

by:PetGuy
ID: 38856414
Thanks so much for the help
0

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