Re: Difference between Select and Omit in LF

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
Please respond to
RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>


To
RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>
cc

Subject
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





The information contained in this communication is confidential and may be 
legally privileged. It is intended solely for the use of the individual or the 
entity to whom it is addressed and others authorised to receive it. If you have 
received it by mistake, please let the sender know by e-mail reply and delete 
it from your system.
If you are not the intended recipient you are hereby notified that any 
disclosure, copying, distribution or taking any action in reliance of the 
contents of this information is strictly prohibited and may be unlawful.
Honda Europe NV is neither liable for the proper and complete transmission of 
the information contained in this communication nor for any delay in its 
receipt.