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Last 3 records by group

46 New Member
How can I retrieve the last 3 records from the following table. The table has the following fields and sample data:

ClientID TransactionID TransactionDate

1 6511216 01/02/2012
1 5332573 18/05/2011
1 9849528 11/02/2012
1 5374530 24/08/2010
1 5711675 26/04/2009
1 4001184 01/09/2011
2 9087526 15/07/2011
2 6524824 06/08/2009
2 5376892 26/07/2011
2 5327891 28/10/2008
2 6423568 11/11/2011
2 5379827 16/06/2012

the results should be (order by TransactionDate ):

ClientID TransactionID TransactionDate

1 4001184 01/09/2011
1 6511216 01/02/2012
1 9849528 11/02/2012
2 5376892 26/07/2011
2 6423568 11/11/2011
2 5379827 16/06/2012


Note: I can't use 'Select Top 3' a. because of the month format b. this must work for a table where TransactionDate is a different field with text data.
Feb 11 '12
69 8582
NeoPa
32,584 Recognized Expert Moderator MVP
It would indeed. I would consider that as fitting within "the data to be defined for use". However, as a solution for this problem, it's not a very strong one, as it involves the data for each record being processed through a function. Fine for small numbers of records, but you say the numbers are large in this case, so I would advise use of a separate table to manage the ordering for you.
Feb 12 '12 #21
Rabbit
12,516 Recognized Expert Moderator MVP
Try something like this:
Expand|Select|Wrap|Line Numbers
  1. SELECT T1.groupField, T1.orderField, T1.otherField
  2. FROM someTable T1,
  3.    someTable T2
  4. ON T1.groupField = T2.groupField
  5.    AND T1.orderField < T2.orderField
  6. GROUP BY T1.groupField, T1.orderField, T1.otherField
  7. HAVING COUNT(*) < 3
Feb 13 '12 #22
NeoPa
32,584 Recognized Expert Moderator MVP
Assuming we start with your table (for convenience we'll refer to it as [tblTransaction] unless/until we hear otherwise) and a new table called [tblHebrewMonthO rder] with the following setup and data :
Table Name = [tblHebrewMonthO rder]
Expand|Select|Wrap|Line Numbers
  1. HebrewMonth  MonthOrder
  2. Tishrei              1
  3. Cheshvan             2
  4. Kislev               3
  5. Tevet                4
  6. Shvat                5
  7. Adar I               6
  8. Adar II              7
  9. Nissan               8
  10. Iyar                 9
  11. Sivan               10
  12. Tammuz              11
  13. Av                  12
  14. Elul                13
Next we have a query called [qryTranData] which is simply a query that links the data in [tblTransaction] with that in [tblHebrewMonthO rder] and shows the order required :
Query Name = [qryTransactionH ebrew]
Expand|Select|Wrap|Line Numbers
  1. SELECT   tT.ClientID
  2.        , tT.TransactionNumber
  3.        , tHMO.MonthOrder
  4. FROM     [tblTransaction] AS [tT]
  5.          INNER JOIN
  6.          [tblHebrewMonthOrder] AS [tHMO]
  7.   ON     tT.TransactionHMonth = tHMO.HebrewMonth
  8. ORDER BY tT.ClientID ASC
  9.        , tHMO.MonthOrder DESC
We now have a dataset which contains the requisite information as well as being sorted in the correct order (which will be ignored when we use it again in [qryTransactionT op], but may be helpful to you for viewing the data and understanding what is what).

Query Name = [qryTransactionT op]
Expand|Select|Wrap|Line Numbers
  1. SELECT   qTT1.*
  2. FROM     [qryTransactionTop] AS [qTT1]
  3.          INNER JOIN
  4.          [qryTransactionTop] AS [qTT2]
  5.   ON     (qTT1.ClientID = qTT2.ClientID)
  6.  AND     (qTT1.MonthOrder >= qTT2.MonthOrder)
  7. GROUP BY qTT1.ClientID
  8.        , qTT1.TransactionNumber
  9.        , qTT1.MonthOrder
  10. HAVING   Count(qTT1.*) < 4
  11. ORDER BY qTT1.ClientID ASC
  12.        , qTT1.MonthOrder DESC
The idea at this point is to link the query to itself on [ClientID] and [MonthOrder] and treat each record of the first query as a GROUP. With the AND line (#6) limiting which records of the second query are included, the HAVING clause can pick out only those GROUPs where the number of records is up to three.
Feb 13 '12 #23
moishy101
46 New Member
NeoPa:

I tried what you suggested and I got some errors.
In qryTransactionT op there is a syntax error on Count(qTT1.*) < 4
In qryTransactionH ebrew I get a Enter Parameter Value on tHMO.Order
Feb 13 '12 #24
NeoPa
32,584 Recognized Expert Moderator MVP
Have you set up the table [tblHebrewMonthO rder] as illustrated on your system?
Feb 13 '12 #25
moishy101
46 New Member
Yes I have.
Thanks for your help.
Feb 13 '12 #26
NeoPa
32,584 Recognized Expert Moderator MVP
Found it. My mistake. I changed the design half way through and missed updating one of the references. I've updated it no so you can try it again if you re-copy/paste the contents of [tblHebrewMonthO rder].

PS. Let me know if replacing qTT1.* with simply * in line #10 works for [qryTransactionT op] :
Expand|Select|Wrap|Line Numbers
  1. HAVING   Count(*) < 4
Feb 13 '12 #27
moishy101
46 New Member
Thank you, as you know you've successfully changed the qryTransactionH ebrew, but I still get the syntax error on Count(qTT1.*) < 4 even after changing it to Count(*) < 4
Feb 13 '12 #28
Rabbit
12,516 Recognized Expert Moderator MVP
Where is the tHMO.Order that you mentioned in your error? I don't see it in NeoPa's code so it shouldn't be in your code either.
Feb 13 '12 #29
moishy101
46 New Member
Rabbit:

NeoPa corrected the query as you can see from the last edited on post #23.
Feb 13 '12 #30

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