IBM Mainframe Forum Index
 
Log In
 
IBM Mainframe Forum Index Mainframe: Search IBM Mainframe Forum: FAQ Register
 

Union All Query


IBM Mainframe Forums -> DB2
Post new topic   Reply to topic
View previous topic :: View next topic  
Author Message
nikyojin

New User


Joined: 05 Oct 2005
Posts: 94

PostPosted: Wed Jan 18, 2006 3:51 pm
Reply with quote

Hi,
I have been analysing a Cobol-Db2 program.I found a really strange query rather I'm not able to grasp the motive behind the Query.
Query
Code:
Select count(*)
into WS-COUNT
from I_Coverage
where I_Code = 'INDIV'
union all
Select count(*)
into WS-COUNT
from I_Coverage
where I_Code = 'GROUP'

The first thing that bothers me, this Query is not declared as a cursor.The result of this Query will definitely give 2 values...One giving the no of active individual coverages and second giving the no of active group coverages.
During execution the latest value ie the one belonging to active group coverages will be the final value.
Can anyone explain why such a query is fired...Thanx in advance...
Back to top
View user's profile Send private message
DavidatK

Active Member


Joined: 22 Nov 2005
Posts: 700
Location: Troy, Michigan USA

PostPosted: Thu Jan 19, 2006 1:40 am
Reply with quote

Veeeeery interesting,

In a small test I did, I received a -811 SQLCODE. DB2 performed the second count(*) first, stored the value, then gave a -811. The code you have must not be checking for multiple rows.

Certainly, this is not doing what the author expected.

Dave,
Back to top
View user's profile Send private message
nikyojin

New User


Joined: 05 Oct 2005
Posts: 94

PostPosted: Thu Jan 19, 2006 10:48 am
Reply with quote

Thanks Dave for the prompt reply.
I'm working on a reverse engineering task and the query makes no sense at all. I haven't received much info regarding the actual requirements...
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic View Bookmarks
All times are GMT + 6 Hours
Forum Index -> DB2

 


Similar Topics
Topic Forum Replies
No new posts RC query -Time column CA Products 3
No new posts Dynamically pass table name to a sele... DB2 2
No new posts Query on edit primary command CLIST & REXX 5
No new posts Query on edit primary command CLIST & REXX 1
No new posts Issue with EXEC CICS QUERY SECURITY c... CICS 6
Search our Forums:

Back to Top