Portal | Manuals | References | Downloads | Info | Programs | JCLs | Mainframe wiki | Quick Ref
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Profile Log in to check your private messages Log in
 
Comparison of DOUBLE data type in DB2

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> DB2
View previous topic :: :: View next topic  
Author Message
gvshruthi

New User


Joined: 05 Jan 2009
Posts: 4
Location: bangalore

PostPosted: Thu Jan 19, 2012 5:12 pm    Post subject: Comparison of DOUBLE data type in DB2
Reply with quote

Dear All,

I was facing a very strange issue while querying on a DB2 table.
There are 2 volume values i get from 2 columns in 2 different tables and both the fields have the datatype as DOUBLE for the volume field.

I need to update a third table based on the below comparison:

If table1.volume < table2.volume, then update flag in table3 to 'L'.

But for some records where the volume is EQUAL in both table1 and table2, i still find that the table 3 record is updated to 'L'.

But say, if i CAST the 2 fields being compared to CHAR or INT type i do not get the problem. I get this only when i use the datatype DOUBLE.

Can anyone help me on how the comparison takes place for DOUBLE data type in DB2?
Back to top
View user's profile Send private message

Akatsukami

Global Moderator


Joined: 03 Oct 2009
Posts: 1786
Location: Bloomington, IL

PostPosted: Thu Jan 19, 2012 7:56 pm    Post subject:
Reply with quote

DB2 data type DOUBLE is double-precision floating point (equivalent to COBOL COMP-2). It is unlikely that a decimal quantity can be represented without truncation issues that will lead to the result that you mention. I would inquire of the designer why this column needs to be floating point.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> DB2 All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts 3270 Data stream error Benchwarmer CICS 6 Tue Apr 17, 2018 12:06 am
No new posts How to list data set names with diffe... murali.andaluri CLIST & REXX 8 Thu Apr 12, 2018 11:33 pm
No new posts Invalid XML character while producing... nikhil.bhole IBM Tools 4 Tue Mar 20, 2018 1:24 am
No new posts Get the list of data sets on DASD and... rakaitn JCL & VSAM 3 Thu Mar 08, 2018 12:38 pm
No new posts Data security erase on RAID device steve-myers All Other Mainframe Topics 0 Sat Jan 13, 2018 6:41 am

Facebook
Back to Top
 
Job Vacancies | Forum Rules | Bookmarks | Subscriptions | FAQ | Polls | Contact Us