Question

Group and Count consecutive numbers in an Access dataset

Asked by: BenBeall

I have a dataset where I need to count the occurance of consecutive numbers.  The challenge is that the same number can show up throughout the dataset, so you can't do a simple group by and count.  Each row has a unique row ID that increments by 1.  

It is simple to do in Excel with row+1 formulas, but in a database it has been tuff.  I have been able to get close by joining the table to itself on the Unique ID +/- 1 to get the previous and next day values in one record, however that does not solve my objective of getting a count of consecutive values when the same value can show up more than once in separate places.

Here is a subset of the data:
ID      COBDate      Name      Value
821902      11/27/06      Series1      7.008571667
821903      11/28/06      Series1      7.008571667
821904      11/29/06      Series1      7.008571667
821905      11/30/06      Series1      7.007347143
821906      12/01/06      Series1      7.008571667
821907      12/04/06      Series1      7.008571667
821908      12/05/06      Series1      7.008571667

should result in:
Count 1: 7.008571667 = 3
Count 2: 7.007347143 = 1
Count 3: 7.008571667 = 3

Also attached is an excel file to import to Access for testing.

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Asked On
2009-11-05 at 07:59:45ID24874849
Tags

Access 2007 Consecutive Numbers Count

Topics

Microsoft Access Database

,

SQL Query Syntax

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: peter57rPosted on 2009-11-05 at 08:17:19ID: 25751008

You will need to add a 'groupno' field to the table.
Then read the records using a recordset .Aallocate groupno 1 to the first record, and keep allocating number 1 until you get a change in 'value', then increment the group number and repeat until the end oof file.
The recordset MUST specify the ID field as the sort order otherwise you cannot guarantee the sequence will be what you want.

Once you have allocated the group numbers you can then run a straightforward Group by query to count the records in each group.

 

by: harfangPosted on 2009-11-05 at 08:24:48ID: 25751076

It's also easy when looping through a recordset from VB. In a query, it's more complex because Access has no built-in method to refer to the previous record.

However, you can find the previous record with the highest ID and a different Value. This creates a possible grouping expression:

SELECT First(Value) As Val, Count(*) As N
FROM
  (SELECT
     A.ID,
     A.Value,
     (Select Top 1 ID From YourSample B
      Where A.Value<>A.Value And A.ID<B.ID
      Order by ID Desc
     ) AS grp
    FROM YourSample A
  ) As C
GROUP BY grp

I hope this helps
(°v°)

With CurrentDb.OpenRecordset("YourSample")
    Do Until .EOF
        If !Value = strPrevious Then
            Debug.Print strPrevious, lngCount
            lngCount = 0
        Else
            strPrevious = !Value
            lngCount = lngCount + 1
        End If
    Loop
End With

                                              
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by: BenBeallPosted on 2009-11-05 at 08:29:51ID: 25751133

Also, I'm trying to avoid any VB because I need to acess the view from a separate reporting application and the data updates on  a daily basis.

 

by: harfangPosted on 2009-11-05 at 08:35:25ID: 25751194

Rereading, my WHERE clause is mixed up. Replace this line:

      Where B.Value<>A.Value And B.ID<A.ID

(°v°)

 

by: BenBeallPosted on 2009-11-05 at 08:57:04ID: 31650550

Awesome, thanks!

 

by: BenBeallPosted on 2009-11-05 at 11:11:43ID: 25752803

20120131-EE-VQP-002

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