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To add my .02 cents to what has been a very interesting thread, I remember
that many, many years ago, one of my first IBM instructors told us that, at
the very least, 70% of the time of an IT department (in those days we
called it DP) was used in maintaining (debugging, extending, adapting, etc)
existing programs.
That being the case, you have to balance the benefits of a program being a
little bit faster against the time you spend designing your own algorithm,
many times from scratch. Also, if there is any problem with the result of
the function you have, again, to check the code and wonder where it may be
wrong. As you stated, I can assume (somewhat safely) that a SQL function
will return the correct result every time.
Nevertheless, as always, every shop has different requirements and needs,
so I can easily conceive that in some cases that "little bit faster" can be
useful.
Best Regards,
Luis
Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries
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