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Union All Query

 
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nikyojin

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Joined: 05 Oct 2005
Posts: 94

PostPosted: Wed Jan 18, 2006 3:51 pm    Post subject: Union All Query
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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...
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DavidatK

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

PostPosted: Thu Jan 19, 2006 1:40 am    Post subject: Re: Union All Query
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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,
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nikyojin

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Joined: 05 Oct 2005
Posts: 94

PostPosted: Thu Jan 19, 2006 10:48 am    Post subject: Re: Union All Query
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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...
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