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I am working on a program that needs to update certain records of a
somewhat large file. Because it could potentially be run multiple times a
day I would like to limit the number of records that it processes by
creating a logical file (preferably with SQL rather than DDS). There are
two fields that need to be looked at. FIELD1 could have numerous possible
values but I'm only interested in A, B, and C. FIELD2 is a status field.
If it's blank then the record needs to be processed. If it has a value
that I assign, such as X, then it has been previously processed and can be
skipped in subsequent runs. Basically I want a logical file that does
something like:
If FIELD2 <> 'X'
If FIELD1 = 'A' or FIELD1 = 'B' or FIELD1 = 'C'
process the record
FIELD1 = 'X'
update the record
ENDIF
ENDIF
I've tried setting up a logical using select and omit but it either
includes or excludes too much. I could probably do it with an open query
file but that introduces a bit of overhead each time the program is run.
Can anybody recommend a good way to do this with SQL? Thanks.
Dave Parnin
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