Solved

putting IF logic into a calculated column?

Posted on 2010-08-17
7
265 Views
Last Modified: 2012-05-10
With the below query, is it possible to insert some logic which would output a text string into the next column depending on the value of the last column (which is calculated)

e.g. "small" if value <= 10, otherwise "large"

Or do we need to do some logic in TSQL for this?
i.e. open up a cursor, store the value of col#4 in a variable, do our logic on it, and output a string using PRINT depending on its value ?

cheers!
select EA.ex_pi_eval_answer_school_id, 
SUM(CAST(EA.ex_pi_eval_answer_response AS DECIMAL)), 
COUNT(EA.ex_pi_eval_answer_response),
SUM(CAST(EA.ex_pi_eval_answer_response AS DECIMAL)) / COUNT(EA.ex_pi_eval_answer_response)

from tbl_ex_ProgramImpact_eval_answers EA

where EA.ex_pi_eval_answer_ProgramObjective_id = 1

group by EA.ex_pi_eval_answer_school_id

Open in new window

0
Comment
Question by:zorba111
[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
  • 4
  • 2
7 Comments
 

Author Comment

by:zorba111
ID: 33455172
NB typical output from the current query is like:

2036449      19      5      3.8
4010885      22      10      2.2
1116159      23      5      4.6
2046646      23      5      4.6
4036081      23      5      4.6
1016647      22      5      4.4
2036149      21      5      4.2
4230165      20      5      4

(excel, which I've used as an intermediary to copy this data, has stripped out non-significant trailing zeros)
0
 
LVL 16

Accepted Solution

by:
vdr1620 earned 400 total points
ID: 33455212
you can use a CASE Statement Like

OUTPUTColumn = CASE WHEN Value<=10 THEN 'Small' ELSE 'Large' END

The below blog has some good explanation with examples
http://blog.sqlauthority.com/2007/04/14/sql-server-case-statementexpression-examples-and-explanation/
0
 

Author Comment

by:zorba111
ID: 33455333
@vdr1620

Hi this is great, however having read up on CASE WHEN, I fear it will not work.

I had simplified my problem somewhat, so its not your fault!

There are actually three ranges (NOT two) that the values could fall into, and for each value, a different string gets output :-(
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 
LVL 16

Assisted Solution

by:vdr1620
vdr1620 earned 400 total points
ID: 33455374
Not a problem..you can use

CASE WHEN (condition) THEN Statement
          WHEN (condition) THEN Statement
           WHEN (condition) THEN Statement END

OUTPUTColumn = CASE WHEN Value<=10 THEN 'Small'
                                        WHEN Value >10 THEN 'Large'
                                        WHEN Value >100 THEN 'SomeotherValue'        END

0
 

Author Comment

by:zorba111
ID: 33455382
@vdr1620

hmm, having looked at Pinal Dave's page (the link you kindly referred me to), I think now that all may not be lost!

I will report back....
0
 

Author Comment

by:zorba111
ID: 33455419
ok, it wasn't in his blog, but in MSDN I found this usage....

SELECT    'Price Category' =
      CASE
         WHEN price IS NULL THEN 'Not yet priced'
         WHEN price < 10 THEN 'Very Reasonable Title'
         WHEN price >= 10 and price < 20 THEN 'Coffee Table Title'
         ELSE 'Expensive book!'
      END,
   CAST(title AS varchar(20)) AS 'Shortened Title'
FROM titles
ORDER BY price
0
 
LVL 69

Assisted Solution

by:Scott Pletcher
Scott Pletcher earned 100 total points
ID: 33460045
You can also do something like this, if you need to:

SELECT
    CASE WHEN price IS NULL THEN '...'
              WHEN price < 10 THEN '...'
              WHEN price >= 10 AND price < 20 THEN '...'
              ELSE '...' END +
    ',' +
    CASE
              WHEN size < 10 THEN 'Small'
              WHEN size > 10 AND size < 20 THEN 'Medium'
              WHEN size >= 20 THEN 'Large'
              ELSE 'Unknown size' END
0

Featured Post

Independent Software Vendors: 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

Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
In this article we will learn how to fix  “Cannot install SQL Server 2014 Service Pack 2: Unable to install windows installer msi file” error ?
Using examples as well as descriptions, and references to Books Online, show the different Recovery Models available in SQL Server and explain, as well as show how full, differential and transaction log backups are performed
This videos aims to give the viewer a basic demonstration of how a user can query current session information by using the SYS_CONTEXT function

733 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