?
Solved

Average columns togather

Posted on 2014-03-31
11
Medium Priority
?
115 Views
Last Modified: 2014-08-23
Hello:

I am trying to average two columns together. When I average them it gets adds the columns together instead of averaging it.

SELECT Question, JAN_Y, JAN_N, JAN_NA, JAN_TOTAL, FEB_Y, FEB_N, FEB_NA, FEB_TOTAL, AVG(JAN_TOTAL + FEB_TOTAL) AS TOTAL
(
SELECT Question, JAN_Y, JAN_N, JAN_NA, CONVERT(numeric(5,2), JAN_TOTAL) AS JAN_TOTAL, FEB_Y, FEB_N, FEB_NA, CONVERT(numeric(5,2), FEB_TOTAL) AS FEB_TOTAL   
FROM
(
SELECT Question,
JAN_Y,
JAN_N,
JAN_NA,
ISNULL((JAN_Y)/NULLIF((JAN_Y+JAN_N),0),0)*100 AS JAN_TOTAL,
FEB_Y,
FEB_N,
FEB_NA,
ISNULL((FEB_Y)/NULLIF((FEB_Y+FEB_N),0),0)*100 AS FEB_TOTAL
FROM
DATA
)
TABLE1
)
TABLE2
GROUP BY Question, JAN_Y, JAN_N, JAN_NA, JAN_TOTAL, FEB_Y, FEB_N, FEB_NA, FEB_TOTAL 

Open in new window

0
Comment
Question by:RecipeDan
[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
  • 5
  • 3
  • 2
  • +1
11 Comments
 
LVL 40

Expert Comment

by:lcohan
ID: 39967196
I'm not 100% sure what do you mean however...why not using SQL Aerage function instead?

http://technet.microsoft.com/en-us/library/ms177677(v=sql.105).aspx
0
 
LVL 1

Author Comment

by:RecipeDan
ID: 39967214
I am using the average function

SELECT Question, JAN_Y, JAN_N, JAN_NA, JAN_TOTAL, FEB_Y, FEB_N, FEB_NA, FEB_TOTAL, AVG(JAN_TOTAL + FEB_TOTAL) AS TOTAL

Open in new window

0
 
LVL 40

Accepted Solution

by:
lcohan earned 2000 total points
ID: 39967249
I meant like:

SELECT Question,
      JAN_Y,
      JAN_N,
      JAN_NA,
      CONVERT(numeric(9,2), ISNULL((JAN_Y)/NULLIF((JAN_Y+JAN_N),0),0)*100) AS JAN_TOTAL,
      FEB_Y,
      FEB_N,
      FEB_NA,
      CONVERT(numeric(9,2), ISNULL((FEB_Y)/NULLIF((FEB_Y+FEB_N),0),0)*100) AS FEB_TOTAL,
      AVG(JAN_TOTAL + FEB_TOTAL)
FROM DATA
GROUP BY Question, JAN_Y, JAN_N, JAN_NA, JAN_TOTAL, FEB_Y, FEB_N, FEB_NA, FEB_TOTAL
0
Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

 
LVL 1

Author Comment

by:RecipeDan
ID: 39967271
It is still adding the columns
0
 
LVL 40

Expert Comment

by:lcohan
ID: 39967284
create view test as
SELECT Question,
      JAN_Y,
      JAN_N,
      JAN_NA,
      CONVERT(numeric(9,2),ISNULL(JAN_Y,0))/CONVERT(numeric(9,2), NULLIF((JAN_Y+JAN_N),0),0) * 100 AS JAN_TOTAL,
      FEB_Y,
      FEB_N,
      FEB_NA,
      CONVERT(numeric(9,2),ISNULL(FEB_Y,0))/CONVERT(numeric(9,2), NULLIF((FEB_Y+FEB_N),0),0) * 100 AS FEB_TOTAL
FROM DATA WITH (NOLOCK);
GO

select Question, AVG(JAN_TOTAL + FEB_TOTAL) as AvgTotal
from test
GROUP BY Question;
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 39967292
This computation:
ISNULL((JAN_Y)/NULLIF((JAN_Y+JAN_N),0),0)*100 AS JAN_TOTAL
gives you a ratio (%) of Y to N: you can't accurately avg ratios anyway.

I think for this you need to use the other method of calculating an average: SUM() / COUNT().

That way, you can use CASE within the SUM and COUNT to get the specific average(s) you need.


I'd code it real quick for you, but I'm not sure what average(s) you're trying to get.

What average(s) are you trying to calculate?
0
 
LVL 1

Author Comment

by:RecipeDan
ID: 39967318
The average of columns Jan_Total and Feb_Total
0
 
LVL 1

Author Comment

by:RecipeDan
ID: 39967327
I am looking for something like this:

Avg(Jan_Total + Feb_Total) AS TwoMonthAvg
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 39967357
But "Jan_Total" and "Feb_Total" are themselves ratios, and you can't avg a ratio.

So do you want the average of the total of Jan_Y = 1 or Feb_Y = 1?  Or Jan and Feb?

That is, if the whole table had just one row, with Jan_Y = 1 and Feb_Y = 0, would the "avg" be 1.0 or 0.5?
0
 
LVL 1

Author Comment

by:RecipeDan
ID: 39967377
For example say the Jan_Total is 89.75 and Feb_Total is 79.4. I want a column that shows 84.57. When finished I need the columns to look like this:

Jan_Y            Jan_N         Jan_NA     Jan_Total            Feb_Y           Feb_N          Feb_NA  Feb_Total             2MonthAvg (which is the averaging of Jan_total _ Feb_Total)
0
 
LVL 41

Expert Comment

by:Sharath
ID: 39968296
It is better if you can provide some sample data and what exactly you want as result?
0

Featured Post

Does Your Cloud Backup Use Blockchain Technology?

Blockchain technology has already revolutionized finance thanks to Bitcoin. Now it's disrupting other areas, including the realm of data protection. Learn how blockchain is now being used to authenticate backup files and keep them safe from hackers.

Question has a verified solution.

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

In the first part of this tutorial we will cover the prerequisites for installing SQL Server vNext on Linux.
What if you have to shut down the entire Citrix infrastructure for hardware maintenance, software upgrades or "the unknown"? I developed this plan for "the unknown" and hope that it helps you as well. This article explains how to properly shut down …
Using examples as well as descriptions, and references to Books Online, show the documentation available for datatypes, explain the available data types and show how data can be passed into and out of variables.
Viewers will learn how the fundamental information of how to create a table.

762 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