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  3. September 2005

SQL efficiency vs. OPNQRYF

Does anybody have any sort of educated opinion on relative efficiency of SQL vs. OPNQRYF, when doing complex (and mostly joined) queries on physical files?
In the project I'm working on that involves taking a rather Rube Goldberg contrivance of OPNQRYF calls, and re-implementing it in SQL, part of the complexity of the old OPNQRYF implementation was that with a complex query involving 2 levels of AND and OR across a bunch of files, trying to do it in a single OPNQRYF would take far longer (order of FOREVER) than breaking it down into a bunch of simpler OPNQRYFs. Am I likely to encounter the same problem with SQL? 

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JHHL

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