Solved

Count Question

Posted on 2013-06-07
6
324 Views
Last Modified: 2013-06-07
Given Table structure:
  StudentID, AttDate, AttCode, PeriodNum

I'm looking for T-SQL to return the count of the number of days for each distinct AttCode where it was used on a day for more than 3 periods.

So.....
StudentID   AttDate     AttCode   PeriodNum
12345         4/7/2013   ACT          1
12345         4/7/2013   ACT          2
12345         4/9/2013   PE            1
12345         4/9/2013   PE            2
12345         4/9/2013   PE            3
12345         4/9/2013   PE            4
12345         4/9/2013   PE            5
12345         4/10/2013   ACT            2
12345         4/10/2013   ACT            3
12345         4/10/2013   ACT            4
12345         4/10/2013   ACT            5
12345         4/14/2013   PE            3
12345         4/14/2013   PE            4
12345         4/14/2013   PE            5
12345         4/14/2013   PE            6

The results I'd like would be:
AttCode     TotalDays
ACT            1
PE              2

The first instance of ACT wouldn't count since there were only two rows for that day for that code.

I'm passing in the StudentID as part of the procedures WHERE clause so it doesn't need to be returned.

js
0
Comment
Question by:jswanberg
6 Comments
 
LVL 23

Expert Comment

by:David
ID: 39229910
Whether or not this is for a classroom assignment, would you please add what you have already tried, and the results?
0
 
LVL 25

Expert Comment

by:jogos
ID: 39229921
Row_number () over ()
0
 
LVL 75

Expert Comment

by:Aneesh Retnakaran
ID: 39229923
;With c as (
SELECT AttDate,ATTCode, rn = ROW_NUMBER() over ( partition by AttDate, AttCode Order by PerodNum)
From YourTable
)

SELECT AttCode, Count(Distinct AttCode) cnt
FROM c
WHERE rn > 3
GROUP BY AttDate, AttCode
0
 
LVL 76

Accepted Solution

by:
slightwv (䄆 Netminder) earned 200 total points
ID: 39229939
Taking a leap of faith this isn't homework, another version:

select attCode, count(*) from (
      select attCode
      from table
      group by attcode, attdate
      having count(*) > 3
)
group by attCode
/
0
 

Author Closing Comment

by:jswanberg
ID: 39229989
Worked great - knew it was going to be a simple nested select.  Thanks!
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

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

Long way back, we had to take help from third party tools in order to encrypt and decrypt data.  Gradually Microsoft understood the need for this feature and started to implement it by building functionality into SQL Server. Finally, with SQL 2008, …
In this article I will describe the Copy Database Wizard method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

773 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