Re: Difference between Select and Omit in LF

["Peter Colpaert" <Peter.Colpaert@xxxxxxxxxxxx>]

Brian,

so you are saying that the order of select/omit plays a role?

But this doesn't make sense: the order is the same in both cases, the only
difference is that in the 'omit' case a lot of records are skipped, and in
the 'select' case a few records are selected.

Thanks anyway,

Peter



Brian Parkins <parkib@xxxxxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
12/05/2004 15:39
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RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>


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RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>
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Re: Difference between Select and Omit in LF






Peter, I would suggest the performance differences are to be expected - it

depends on the data.

The following is taken from the iSeries DB2 Programming Manual, (see
Select/Omit section under Logical Files):

"The fewer comparisons, the more efficient the task is. So, when you have
several select/omit
comparisons, try to specify the one that selects or omits the most records

first."

Brian Parkins





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