Re: Group by .. with rollup having
HAVING is not useful with WITH ROLLUP.
http://dev.mysql.com/doc/refman/5.0/en/group-by-modifiers.html:
"Because the NULL values in the super-aggregate rows are placed into the result set at such a late stage in query processing, you cannot test them as NULL values within the query itself. For example, you cannot add HAVING product IS NULL to the query to eliminate from the output all but the super-aggregate rows."
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August 02, 2006 07:42PM
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Re: Group by .. with rollup having
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May 20, 2009 09:30AM
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