According to perldoc Class::DBI:
Of course, any query can be added via set_sql, including joins. So, to add a query that returns the 10 Artists with the most CDs, you could write (with MySQL):
Music::Artist->set_sql(most_cds => qq{
SELECT artist.id, COUNT(cd.id) AS cds
FROM artist, cd
WHERE artist.id = cd.artist
GROUP BY artist.id
ORDER BY cds DESC
LIMIT 10
});
my @artists = Music::Artist->search_most_cds();
HTH.
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