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)