Solved

Calculating the Data in Oracle

Posted on 2011-09-27
11
332 Views
Last Modified: 2012-05-12
I had to calculate varience in oracle. I know there is a function in oracle named varience

I am doing VARIENCE as (MyExpectedData - MyActualReturns)

1. How Does Varience Work...

2. Alo I want to Return data as Percentage for one of the column which is a combination of two columns as:

(Column1/Column2)*100 as myNewData

But this does has errors, if there is a division by zero. It throws an error and second how do i bring its result in percentage sign with it

Please Guide

Thanks
0
Comment
[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
  • 7
  • 4
11 Comments
 
LVL 16

Expert Comment

by:Swadhin Ray
ID: 36715069
For getting % symbol you can concatenate with % sign like :

select (((1/1)*100)||'%') percent_data from dual ;


>>> this does has errors, if there is a division by zero.

Can you provide some sample data so that we can check ?
0
 
LVL 16

Expert Comment

by:Swadhin Ray
ID: 36715082
For how variance work ... please find the link below :

http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/functions212.htm
0
 
LVL 16

Author Comment

by:Gurpreet Singh Randhawa
ID: 36715508
yes!

sample data like this


select
column1, column2,
(column1/column2 * 100) as column3
from my table

So this is how i am getting the data, But please also tell if there is a divison by zero then how we do handle it
0
Free Backup Tool for VMware and Hyper-V

Restore full virtual machine or individual guest files from 19 common file systems directly from the backup file. Schedule VM backups with PowerShell scripts. Set desired time, lean back and let the script to notify you via email upon completion.  

 
LVL 16

Expert Comment

by:Swadhin Ray
ID: 36715655
Please find the example as :

create  temp_t (col1 number , col2 number);

begin
insert into temp_t values (1,1);
insert into temp_t values (1,0);
end;

commit;

Error Query:

SQL> select (((col1/col2)* 100 )||'%') data_percent from temp_t ;

Valid Query:

SQL> select  ((CASE WHEN (NVL(max(col2),0) = 0) THEN 0 ELSE ( col1/col2)* 100 END)||'%') percent  
  from temp_t
group by col1,col2;
0
 
LVL 16

Expert Comment

by:Swadhin Ray
ID: 36715700
you can remove the max from the valid query ......
0
 
LVL 16

Accepted Solution

by:
Swadhin Ray earned 500 total points
ID: 36715723
Valid Query:

SQL> select  ((CASE WHEN (NVL(col2,0) = 0) THEN 0 ELSE ( col1/col2)* 100 END)||'%') percent  
  from temp_t
group by col1,col2;
0
 
LVL 16

Author Comment

by:Gurpreet Singh Randhawa
ID: 36716031
why using groupby
0
 
LVL 16

Author Comment

by:Gurpreet Singh Randhawa
ID: 36716047
also if omit group it will display correct data rt, also does it handles the decimal places also
0
 
LVL 16

Expert Comment

by:Swadhin Ray
ID: 36716057
...you can remove group by  condition...
0
 
LVL 16

Author Comment

by:Gurpreet Singh Randhawa
ID: 36716118
also will decilams play good
0
 
LVL 16

Expert Comment

by:Swadhin Ray
ID: 36716218
just try it and let us know if you get any issues
0

Featured Post

Will your db performance match your db growth?

In Percona’s white paper “Performance at Scale: Keeping Your Database on Its Toes,” we take a high-level approach to what you need to think about when planning for database scalability.

Question has a verified solution.

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

As technology users and professionals, we’re always learning. Our universal interest in advancing our knowledge of the trade is unmatched by most industries. It’s a curiosity that makes sense, given the climate of change. Within that, there lies a…
Recently, Microsoft released a best-practice guide for securing Active Directory. It's a whopping 300+ pages long. Those of us tasked with securing our company’s databases and systems would, ideally, have time to devote to learning the ins and outs…
This video shows how to recover a database from a user managed backup
This video shows how to copy an entire tablespace from one database to another database using Transportable Tablespace functionality.

635 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