RE: sql Vs RLA to test existance -- RPG400-L

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What about

Select count(*) into :X from ???? myfield = 'myfield') ?

“If you think education is expensive, try ignorance"
(Derek Bok, pres. of Harvard Univ. 1971-1990)

From: David.FOXWELL@xxxxxxxxx
To: rpg400-l@xxxxxxxxxxxx
Date: Tue, 15 Feb 2011 15:44:30 +0100
Subject: sql Vs RLA to test existance

Hi,

I need to find if a transaction of a particular type and amount exists for a client.

I cannot remember how to apply the SQL Exists( ) to look for the transaction.

Select '1' from ???? where exists ( select * from mytable where myfield = 'myfield')

Then again, I seem to remember that EXists will scan all the rows and not just stop at the first one that satisfies the search criteria as I could do with RLA.

Can someone put me straight please?

Thanks.

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