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
 
Getting diff values for the same filter criteria using float

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

New User


Joined: 04 Jun 2009
Posts: 30
Location: Bangalore

PostPosted: Wed May 12, 2010 3:10 pm    Post subject: Getting diff values for the same filter criteria using float
Reply with quote

I was in the process of optimizing a query, for that i had to negate a column so that the index doesn't participate in the execution.

Previous Query:

Code:
SELECT COUNT(*),                                     
       SUM(X),                           
       SUM(FLOAT(Y)),                 
       SUM(Z)                                   
   FROM T1 A , T2 B
   WHERE A.HIST = 'H'
    AND B.CD = 'ABC'                 
     AND A.ID = B.ID                         
     AND A.DT = '04/26/2010';   


Results:
Code:
38616                  3109401.380000  -0.1518154911700070E+09   4152744718.859000


New Query :

Code:
SELECT COUNT(*),                                     
       SUM(X),                           
       SUM(FLOAT(Y)),                 
       SUM(Z)                                   
   FROM T1 A , T2 B
   WHERE (A.HIST = 'H' OR 0=1)
    AND B.CD = 'ABC'                 
     AND A.ID = B.ID                         
     AND A.DT = '04/26/2010';         


Results:
Code:
38616                  3109401.380000  -0.1518154911700006E+09   4152744718.859000


I am unable to identify why there is differnce in the value of SUM(FLOAT(Y)),

Code:
-0.1518154911700070E+09
-0.1518154911700006E+09
Back to top
View user's profile Send private message

GuyC

Senior Member


Joined: 11 Aug 2009
Posts: 1281
Location: Belgium

PostPosted: Wed May 12, 2010 5:11 pm    Post subject:
Reply with quote

have you tried with SUM(decFLOAT(Y,34)) ?
Back to top
View user's profile Send private message
ashimer

Active Member


Joined: 13 Feb 2004
Posts: 551
Location: Bangalore

PostPosted: Wed May 12, 2010 9:47 pm    Post subject:
Reply with quote

What about
Code:

FLOAT(SUM(Y))


?

What is your DB2 Version ?
Back to top
View user's profile Send private message
enrico-sorichetti

Global Moderator


Joined: 14 Mar 2007
Posts: 10326
Location: italy

PostPosted: Wed May 12, 2010 9:57 pm    Post subject: Reply to: Getting diff values for the same filter criteria u
Reply with quote

floating point numbers are approximate,
in general, for approximate numbers the order of operations makes a difference
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 Extend the decimal values in DIVISION Balaryan DFSORT/ICETOOL 3 Thu Oct 05, 2017 4:05 pm
No new posts More than 1 Include criteria for sing... Roy Ware SYNCSORT 6 Wed Sep 13, 2017 11:45 pm
No new posts Working with hex values in Filemanage... Emile Straker IBM Tools 0 Tue Sep 12, 2017 1:42 am
No new posts DB2 NULL Values display V S Amarendra Reddy DB2 3 Thu Sep 07, 2017 6:59 pm
No new posts Moving values to a variable of copybo... Vignesh Sid COBOL Programming 6 Wed Sep 06, 2017 1:04 pm

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