Solved

Count query problem

Posted on 2012-04-05
2
263 Views
Last Modified: 2012-04-05
Suppose I have a table like this,


ProcessDate          FileID
2011-01-01            A0101
2011-01-01            B0101
2011-01-01            C0101
2011-01-02            A0102
2011-01-02            B0102
...
2011-02-01            A0201
2011-02-02      A0202

etc for each day or month where the number of FileID's per day can vary.

I would like to find the month with the maximum number of FileID's

I can write a query like this,


select
Month(ProcessDate) as [Mth],
Count(distinct TRAN_FileID) as [FileCount]
from MyTable
where ProcessDate >= '2011-01-01'
and ProcessDate < '2012-01-01'
Group by Month(ProcessDate)
order by Month(ProcessDate)

from which I can see the maximum number of files for each month

eg.

1            20
2            35
3            10
4            55
etc

Now I want to get the maximum so tried using this query as subquery like this

select Max(FileCount)
from
(
select
Month(ProcessDate) as [Mth],
Count(distinct TRAN_FileID) as [FileCount]
from MyTable
where ProcessDate >= '2011-01-01'
and ProcessDate < '2012-01-01'
Group by Month(ProcessDate)
order by Month(ProcessDate)
)

Unfortunately this gives me this error,
"The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common table expressions, unless TOP or FOR XML is also specified."

How I can I find the month with the maximum number of FileIDs using MS SQL Server 2005?
0
Comment
Question by:DaveChoiceTech
[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
  • 2
2 Comments
 
LVL 13

Expert Comment

by:Ashok
ID: 37812160
I think this should work.....

select Max(FileCount)
from
(
select
Month(ProcessDate) as [Mth],
Count(distinct TRAN_FileID) as [FileCount]
from MyTable
where ProcessDate >= '2011-01-01'
and ProcessDate < '2012-01-01'
Group by Month(ProcessDate)
)

HTH
Ashok
0
 
LVL 13

Accepted Solution

by:
Ashok earned 500 total points
ID: 37812763
select Mth, FileCount
from
(
select
Month(ProcessDate) as [Mth],
Count(distinct TRAN_FileID) as [FileCount]
from MyTable
where ProcessDate >= '2011-01-01'
and ProcessDate < '2012-01-01'
Group by Month(ProcessDate)
) a
WHERE FileCount = (
select Max(FileCount)
from
(
select
Month(ProcessDate) as [Mth],
Count(distinct TRAN_FileID) as [FileCount]
from MyTable
where ProcessDate >= '2011-01-01'
and ProcessDate < '2012-01-01'
Group by Month(ProcessDate)
) b );
 
HTH
Ashok
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

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

Introduction This article will provide a solution for an error that might occur installing a new SQL 2005 64-bit cluster. This article will assume that you are fully prepared to complete the installation and describes the error as it occurred durin…
This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

726 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