There are several conditions where a predicate with ROWNUM will always evaluate to FALSE.
1) ROWNUM >|>= n (rownum greater|greater than or equal to than any number)
2) ROWNUM = 0 (rownum can never be 0)
3) ROWNUM = 2...(rownum can only be assigned to a row that matches the predicate. The first row returned is assigned 1 temporarily and the predicate is checked. Since 1 != 2, it fails and the next row read is assigned rownum of 1 temporarily.)
I have a discussion of ROWNUM, its uses and limitations on my website at www.optimaldba.com/library.html. The Paper/Presentation are SQL Scripting Sorcery.
-- Daniel W. Fink http://www.optimaldba.com
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