<code> $userrows = $wpdb->get_results("
SELECT
usr.ID,
usr.user_email,
fnametab.meta_value AS fname,
lnametab.meta_value as lname,
cnt.post_count
FROM {$wpdb->users} usr
JOIN {$wpdb->usermeta} capa ON usr.ID = capa.user_id AND capa.meta_key LIKE '%capabilities'
LEFT OUTER JOIN {$wpdb->usermeta} fnametab ON usr.ID = fnametab.user_id AND fnametab.meta_key = 'first_name'
LEFT OUTER JOIN {$wpdb->usermeta} lnametab ON usr.ID = lnametab.user_id AND lnametab.meta_key = 'last_name'
{$behaviorSqlJoinMode_Post} JOIN (
SELECT post_author, COUNT(1) post_count
FROM {$wpdb->posts}
WHERE post_type='post'

AND post_status='publish'
GROUP BY post_author

) cnt ON usr.ID = cnt.post_author
WHERE capa.meta_value LIKE '%author%'{$behaviorSqlFilter_MatchContribs}{$behaviorSqlFilter_MatchEditors}{$behaviorSqlFilter_MatchAdmins}
{$behaviorSqlSort}
{$behaviorSqlFilter_LimitPlusOne}
");

return (array) $userrows;    

}
<code>

I pratica dovrei fare in modo che il plugin vada a leggere solo i post di una categoria ( es.: contest). in questo modo ottengo i post inseriti da tutti gli autori in quella determinata categoria.
Spero qualcuno possa aiutarmi