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Do "UNION" or "UNION ALL" have bugs in Oracle 19c (19.3)?

in SQL Language (MOSC) 2 commentsAnswered

SQL 1 and SQL 2 were confirmed do not have any row returned when executed separately, but when SQL 1 union/union all with SQL 2, random different results were returned at each execute. Please refer to the attached screenshots...


Result of the union SQL executed for first time:


Result of same union SQL executed for the second time:


Result of same union SQL executed for the third time:


Result of same union SQL executed for the fourth time:


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