I have come across some unexpected behavior while dealing with a UNION and ORDER BY. I'd like some advice. Here's a scenario where I want to order by null values:
CREATE TABLE test(a int); SELECT a FROM test UNION SELECT a FROM test ORDER BY a IS NULL ASC;
returns:
ERROR: ORDER BY on a UNION/INTERSECT/EXCEPT result must be on one of the result columns
whereas:
SELECT a FROM test UNION SELECT a FROM test ORDER BY a;
works fine. The column name is the same in both queries, yet I get an error! Obviously, this is a gross oversimplification of what I want to do, but I couldn't get it working in this minimal case. I also tried using the column number, and that returns the same results as the name. What am I doing wrong? Thanks for any info.
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AgentM
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