Solved

losing precision in a calculated column

Posted on 2010-08-17
3
257 Views
Last Modified: 2012-05-10
The below query is an example of something I'm struggling with. It produces output like the following:

2052035      10      5      2
5036064      12      5      2
4016002      16      5      3
1010001      23      5      4
5031669      13      5      2
5031163      21      5      4

As you can see from the query, the last column is a calculated column which should give the 2nd column divided by the 3rd column.

I am trying to get the last column to give the exact DECIMAL amount, not an INTEGER. This is why I am trying to cast it etc.

How can I get the exact amount, ie. a decimal type here in this column, not an int ?

We are using SQL Server 2000
select EA.ex_pi_eval_answer_school_id, 
SUM(EA.ex_pi_eval_answer_response), 
COUNT(EA.ex_pi_eval_answer_response),
CAST(SUM(EA.ex_pi_eval_answer_response) / COUNT(EA.ex_pi_eval_answer_response) AS MONEY)

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
  • 2
3 Comments
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 33454940
try this, please
CAST( SUM(EA.ex_pi_eval_answer_response) as MONEY) / CAST(COUNT(EA.ex_pi_eval_answer_response) AS DECIMAL(20,4))

Open in new window

0
 

Author Comment

by:zorba111
ID: 33455011
Got it!!
This works... I remembered from somewhere that the default is to take the type of the first argument of any operator, and cast the result of an expression to that...

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
0
 

Author Comment

by:zorba111
ID: 33455035
@angell

yours works too, also when simplified to:

SUM(EA.ex_pi_eval_answer_response) / CAST(COUNT(EA.ex_pi_eval_answer_response) AS DECIMAL(20,4))
0

Featured Post

Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

Question has a verified solution.

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

In this article I will describe the Detach & Attach 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 article shows gives you an overview on SQL Server 2016 row level security. You will also get to know the usages of row-level-security and how it works
This video shows how to set up a shell script to accept a positional parameter when called, pass that to a SQL script, accept the output from the statement back and then manipulate it in the Shell.
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.

863 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

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now