Oracle-L: ROWNUM strangeness?

From: Paul Baumgartel <treegarden_at_yahoo.com>
Date: Thu, 29 Aug 2002 07:53:27 -0800
Message-ID: <F001.004C28A5.20020829075327@fatcity.com>

I've been given a query to investigate. The performance varies extremely depending on whether the entire result set is fetched or a ROWNUM < n clause is attached; that makes sense to me. What doesn't make sense is the following: if we add WHERE ROWNUM < 50, the query returns 24 rows. If we add WHERE ROWNUM < 1000, the query returns 336 rows!

I don't know the size of the entire result set (I'm running a count right now), but if the result set consists of at least 336 rows, shouldn't WHERE ROWNUM < 50 return 49 rows?

TIA!

Paul Baumgartel, Adept Computer Associates, Inc. paul.baumgartel_at_aya.yale.edu

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Author: Paul Baumgartel
INET: treegarden_at_yahoo.com

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