Perceived 'Wrong Results' Using ROWNUM with DISTINCT or ORDER BY

(Doc ID 1461173.1)

Last updated on FEBRUARY 10, 2017

Applies to:

Oracle Database - Personal Edition - Version 8.0.3.0 and later
Oracle Database - Enterprise Edition - Version 8.0.3.0 and later
Oracle Database - Standard Edition - Version 8.0.3.0 and later
Information in this document applies to any platform.

Symptoms

A select statement using 'DISTINCT' or 'GROUP BY' and a 'ROWNUM' predicate is returning fewer rows than expected.

For example, the following query might return only 10 rows even when there are at least 100 distinct values in the table:

Cause

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