On Tue, 11 Nov 2003 18:49:31 -0500, Chester Kustarz wrote:
[... discussion of top-n query (where n=3) ...]
> select *
> from person
> where age <=
> (select age from person order by age limit 1 offset 2);
It fails when the cardinality of person is less than 3 (returns empty
set). My solution is this, which is not as beautiful any more:
SELECT *
FROM person
WHERE age <= COALESCE ( ( SELECT age FROM person ORDER BY age ASC LIMIT 1 OFFSET 2 -- 2=n-1 ),( SELECT
ageFROM person ORDER BY age DESC -- note: opposite of ASC LIMIT 1 )
);
--
Greetings from Troels Arvin, Copenhagen, Denmark
