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Comments - Why is ORDER BY in a FROM Subquery Ignored?

10 years, 7 months ago roberto spadim
Re: Why is ORDER BY in a FROM subquery ignored?

an 'easy' workaround to this, is:

SELECT field1, field2 FROM (
SELECT field1, field2 FROM table1 
ORDER BY field2
LIMIT 18446744073709551615
) alias

this cause the optimizer to create a temporary table, and use filesort to order the query

the limit number is a 64bit unsigned -1 (2^64-1), this is a big number and can work with 99.999% of queries i know

 
7 years, 1 month ago Nicolas Tazzaz
Re: Why is ORDER BY in a FROM subquery ignored?

@rspadim : Thank you for the workaround but on my biggest table, the time of execution increased since I tried. Do you have another idea ?

 
3 years, 5 months ago Michael Widenius
Re: Why is ORDER BY in a FROM subquery ignored?

Higher execution time is expected if you force an ORDER BY on your biggest table.

 
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