SELECT t.name, COUNT(DISTINCT c.name) FROM sheldule h, audiences a, corps c, subjects s, teachers t
    WHERE c.id = a.corp_id
        AND a.id = h.audience_id
        AND s.id = h.subject_id
        AND t.id = h.teacher_id
GROUP BY t.name
HAVING COUNT(DISTINCT c.name) =
    (SELECT MAX(C) FROM
        (SELECT COUNT(DISTINCT c.name) AS C FROM sheldule h, audiences a, corps c, subjects s
        WHERE c.id = a.corp_id
            AND a.id = h.audience_id
            AND s.id = h.subject_id
        GROUP BY h.teacher_id) AS Q)