Solved

query help - aggregate function

Posted on 2007-03-28
4
169 Views
Last Modified: 2010-03-19
Hi:

I have a table:
EmployeeID   Score
-------------   --------
1                  100
2                     40
3                     40

I want to find out the average score of all employees and the percentage of employees whose score is above average IN ONE QUERY. That is, in this case, the query should return 60 and 0.333. Anyway I can do this? Thanks.
0
Comment
Question by:sdc248
  • 2
  • 2
4 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 250 total points
ID: 18811352
what about this

select  avg_score, ( select cast( count(*) as decimal (10,2)) from yourtable where score >= avg_score) / count_records
from (
select avg(score)  avg_score, count(*) count_records from yourtable
from yourtable
) as l
0
 

Author Comment

by:sdc248
ID: 18811535
Thanks angelIII. I think that'll do it. However, in reality the base table is in fact a result of a complicated sub-query, I don't feel like repeating it in the query. Is there any other way to do it?
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 18811579
with sql server 2005, you can use the CTE (common table expression).
with SQL server 2000 or lower, you could only store the results of the query into a table variable (or temp table), and continue processing from there.
0
 

Author Comment

by:sdc248
ID: 18812008
I use the CTE and it works. Thank you very muich.
0

Featured Post

NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Row insertion failed. Array 5 48
SSAS Store Forecasting data in the cube 1 18
xml files 7 28
Current Month Filter in Visual Studio 10 23
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.
Ever wondered why sometimes your SQL Server is slow or unresponsive with connections spiking up but by the time you go in, all is well? The following article will show you how to install and configure a SQL job that will send you email alerts includ…
Viewers will learn how the fundamental information of how to create a table.
Viewers will learn how to use the SELECT statement in SQL and will be exposed to the many uses the SELECT statement has.

828 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