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Handling Ties in VBA

26 New Member
Hi Folks,

I have an Access 2003 application handling dinghy racing results. I'm looking for a way to handle ties. On the current first recordset pass, the results are fine if there are no ties (orig points). If there are ties, then they need to be handled by a process that recognises that ties exist (elapsed time) and adds together the original values (Orig Points) and divides by the number of ties to create new values (Points Reqd). As in the table below.

Trust this makes sense and that you folks can suggest some suitable code ... with best regards, Brian


Record Elapsed time Orig Points Points Reqd

1 5.5 1 1
2 5.6 2 3
3 5.6 3 3
4 5.6 4 3
5 5.7 5 5
6 5.7 6 5
7 5.8 7 7
8 5.9 8 8
May 30 '13 #1
15 1634
Oralloy
988 Recognized Expert Contributor
helm,

Are you trying to use just SQL, or are you using VBA for this?

Most importantly, what are your requirements? What sorts of information are you trying to extract from this database? It is pretty obvious that you are currently in the design phase, so let's discuss.

Finally, when you put down a data table, you should probably enclose it in CODE tags, or some such, so that we can read it easily. Like this:
Expand|Select|Wrap|Line Numbers
  1.  
  2. This is your data table
  3.  
  4. Record  Elapsed time  Orig Points  Points Reqd
  5.  
  6.    1        5.5           1            1
  7.    2        5.6           2            3
  8.    3        5.6           3            3
  9.  
  10. etc... 
  11.  
Cheers,
Oralloy
May 30 '13 #2
ADezii
8,834 Recognized Expert Expert
Here is my Code Based approach that has been tested and appears to work quite well. The Logic is:
  1. Create a Recordset consisting of Unique Elapsed Times.
  2. Loop through this Recordset testing each Elapsed Time to see if there are Ties.
  3. If there are Tie(s):
    1. Calculate the Total Original Points for these Ties.
    2. Calculate the actual Number of Ties.
    3. Calculate the new Value for Original Points using the Formula:
      Expand|Select|Wrap|Line Numbers
      1. 'Notice use of Integer Division
      2. (Total Original Points \ Number of Ties)
    4. Update your Table (tblTest) with the Recalculated Values for Original Points for each Tie.
  4. The actual Code, which has been tested is:
    Expand|Select|Wrap|Line Numbers
    1. Dim MyDB As DAO.Database
    2. Dim rsUniqueET As DAO.Recordset
    3. Dim intNumOfTies As Integer
    4. Dim intTotalOrigPoints As Integer
    5.  
    6. Set MyDB = CurrentDb
    7.  
    8. 'Create a Recordset consisting of 'Unique' Elapsed Times
    9. Set rsUniqueET = MyDB.OpenRecordset("SELECT DISTINCT [Elapsed Time] FROM tblTest", dbOpenForwardOnly)
    10.  
    11. With rsUniqueET
    12.   Do While Not .EOF
    13.     'For each Unique Elapsed Time, are there other Ties?
    14.     intNumOfTies = DCount("*", "tblTest", "[Elapsed Time] = " & ![Elapsed Time])
    15.       If intNumOfTies > 1 Then   'There are Ties
    16.         'Calculate Total Original Points for the Ties
    17.         intTotalOrigPoints = DSum("[Orig Points]", "tblTest", "[Elapsed Time] = " & ![Elapsed Time])
    18.           'Update Points Required for all the Ties via provided Formula
    19.           CurrentDb.Execute "UPDATE tblTest SET [Points Reqd] = " & (intTotalOrigPoints \ intNumOfTies) & _
    20.                             " WHERE [Elapsed Time] = " & ![Elapsed Time], dbFailOnError
    21.       End If
    22.        .MoveNext
    23.   Loop
    24. End With
    25.  
    26. rsUniqueET.Close
    27. Set rsUniqueET = Nothing
    28.  
  5. Any questions, please feel free to ask.
P.S. - There may be a SQL approach that is more efficient and practical, but SQL is not my area of expertise.
May 30 '13 #3
helm
26 New Member
Hi Adezii,

That's brilliant - finds ties and updates records, Can we take this a step further please? In your solution, all the ties are given the same value - great - but there are some values that would not be integers - if for example there were ties at [orig points] 5 and 6, the values to be assigned [points reqd]would be 5+6/2 = 5.5

Thought I could change through from integer values to single but results still come out as integers ...

Regards, Helm
May 30 '13 #4
zmbd
5,501 Recognized Expert Moderator Expert
You should be able to do this with a ranking query:
How to Rank Records Within a Query

Then there is good-ole Allen Brown:
Ranking or numbering records
May 31 '13 #5
ADezii
8,834 Recognized Expert Expert
If you wish to keep this approach:
  1. Change the Data Type of the [Orig Points] Field in your Table to SINGLE.
  2. Change the SQL Statement used to Update your Table to:
    Expand|Select|Wrap|Line Numbers
    1. CurrentDb.Execute "UPDATE tblTest SET [Points Reqd] = " & _
    2.                              Round((intTotalOrigPoints / intNumOfTies), 2) & _
    3.                             " WHERE [Elapsed Time] = " & ![Elapsed Time], dbFailOnError
  3. This will Round the Results to 2 Decimal Places.
  4. Make sure that you change the Integer Division Operator (\) to Division (/).
  5. As stated earlier, a SQL approach would be more efficient.
May 31 '13 #6
Oralloy
988 Recognized Expert Contributor
helm,

You've obviously found the help you need.

It sounds like you are having difficulty storing the computed values. Remember that even though you calculate using floating-point, if the column you store the data in is an integer type, the digits after the decimal point will be discarded (lost).

Ok, that's my two-cents worth.

Good luck with your project.

Oralloy
May 31 '13 #7
helm
26 New Member
A big thank you to ADezzi - I didn't know that there weretwo division operators! Thanks too for those SQL references - I'm going to look at those in more detail. As you say, an SQL approach is great if you can work out (or find out) how to do it.

Best Regards, helm
May 31 '13 #8
Rabbit
12,516 Recognized Expert Moderator MVP
If I understand correctly, you can join this query to the original table on the [Elapsed time] field.
Expand|Select|Wrap|Line Numbers
  1. SELECT
  2.    [Elapsed time],
  3.    SUM([Orig Points]) / COUNT(*) AS [Points Reqd]
  4. FROM tblTest
  5. GROUP BY [Elapsed time]
May 31 '13 #9
ADezii
8,834 Recognized Expert Expert
@helm:
I must say that Rabbitt's solution is much more elegant, efficient, and professional. I would strongly suggest that you adapt his approach. The only change that you may wish to make is to control the number of Decimal Places displayed, as in:
Expand|Select|Wrap|Line Numbers
  1. SELECT 
  2. [Elapsed time], 
  3. Round(SUM([Orig Points]) / COUNT(*),2) AS [Points Reqd] 
  4. FROM tblTest 
  5. GROUP BY [Elapsed time]
Jun 1 '13 #10

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