Solved

Access Query to Select the 2 Most Recent Records of Each ClientID.

Posted on 2013-01-25
7
398 Views
Last Modified: 2013-01-29
Good afternoon Experts,

I need a query that will select the 2 most recent records for each Client_ID, based on the date in the update_date_utc field. There may be 1, 2, 3, or more instances of each Client_ID. If only 1 instance exists, I don't want it selected. If 2 instances exist, I want both instances selected, and if 3 or more instances exist, I want the 2 most recent instances based on the date in the update_date_utc field. See attached spreadsheet.

Thanks in advance for your help.
Craig
ChangeOwner.xls
0
Comment
Question by:CraigMan
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
7 Comments
 
LVL 61

Expert Comment

by:mbizup
ID: 38820995
Try this:

SELECT t.client_id, t.user_name, t.update_date_utc
FROM tblClients t
WHERE t.client_id IN (
        SELECT TOP 2 cdupe.client_id 
        FROM tblClients cdupe 
        WHERE cdupe.client_id  = t.client_id  AND  cdupe.client_id  IN 
               (SELECT c.client_id
                FROM tblClients c
                GROUP BY c.client_id
                HAVING Count(c.user_name) > 1) 
        ORDER BY cdupe.update_date_utc DESC
)

Open in new window


And take a look at the following article under the heading "top N records per group":
http://allenbrowne.com/subquery-01.html

This is a variation on that, with the HAVING clause limiting the output to groups of two or more.

You may have to replace occurrences of tblClients with your own table name.
0
 
LVL 30

Expert Comment

by:hnasr
ID: 38822998
Removed comment, not for this question.
0
 

Author Comment

by:CraigMan
ID: 38831204
mbixup,

Your solution did eliminate the single instances of client_id, but did not limit the result to the 2 most current records per client_id, if more than 2 instances exist. How do I limit output to 2 most current records?

Craig
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 61

Accepted Solution

by:
mbizup earned 500 total points
ID: 38831450
Here you go...

SELECT t.client_id, t.user_name, t.update_date_utc
FROM tblClients AS t
WHERE (t.client_id &  t.update_date_utc) IN  
(
        SELECT TOP 2 cdupe.client_id & cdupe.update_date_utc 
        FROM tblClients cdupe 
        WHERE cdupe.client_id  =  t.client_id  and  cdupe.client_id  IN 
               (SELECT c.client_id
                FROM tblClients c
                GROUP BY c.client_id
                HAVING Count(c.user_name) > 1) 
        ORDER BY cdupe.update_date_utc DESC
) 

Open in new window


Try Query1 in the attached  DB
db2.mdb
0
 
LVL 30

Expert Comment

by:hnasr
ID: 38832067
Try this:
For table a(aid, f1, f2) - aid is the primary key.
aID      f1      f2
1      1      1
2      1      2
3      1      3
4      2      2
5      4      3
6      4      5

Required output:
aid      f1      f2 - recent as higher f2 means more recent
2      1      2
1      1      1
6      4      5
5      4      3

SELECT a.aid, a.f1, a.f2
FROM a
WHERE ((((select count(x.f1) from a x where a.f1=x.f1))>1) AND (((select count(x.f1) from a x where a.f1=x.f1 and a.aid>=x.aid))<3))
ORDER BY a.f1, a.f2 DESC;

Open in new window

Output:
aid      f1      f2
2      1      2
1      1      1
6      4      5
5      4      3
0
 

Author Closing Comment

by:CraigMan
ID: 38832074
Just what I needed

Thanks
0
 
LVL 61

Expert Comment

by:mbizup
ID: 38832135
Glad to help :)
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I'm trying, I really am. But I've seen so many wrong approaches involving date(time) boundaries I despair about my inability to explain it. I've seen quite a few recently that define a non-leap year as 364 days, or 366 days and the list goes on. …
Preparing an email is something we should all take special care with – especially when the email is for somebody you may not know very well. The pressures of everyday working life stacked with a hectic office environment can make this a real challen…
Familiarize people with the process of utilizing SQL Server views from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Access…
In Microsoft Access, when working with VBA, learn some techniques for writing readable and easily maintained code.

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question