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  2. RPG400-L
  3. February 2011

RE: sql Vs RLA to test existence


-----Message d'origine-----
De : rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] De la part de DeLong, Eric
Envoyé : mardi 15 février 2011 17:46
À : RPG programming on the IBM i / System i
Objet : RE: sql Vs RLA to test existence

I wonder if the real question here is "can I take an
application designed from RLA perspective, and turn this into
a SQL application?" I think trying to convert from RLA to
SQL without breaking out of the RLA mindset results in
frustration and dissatisfaction.

For SQL to be really effective, you need to "rethink" how you
accomplish your goals. Just converting chain, setll, read,
or write into SQL alternatives misses the point of
set-oriented operation of SQL.

I thought at first I was needing a set operation as I needed to compare the maximum rate for all transactions against a reference rate.
That meant reading all transactions. But in fact I only needed to know if one of those transactions reached the reference rate.

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