SELECT h.name,hospsub ,COUNT(vn.vn),COUNT(DISTINCT(vn.hn)) FROM vn_stat vn
LEFT OUTER JOIN hospcode h ON vn.hospsub = h.hospcode
WHERE vn.vstdate BETWEEN '2010-10-01' AND '2011-04-30'
AND vn.hospmain = '11307'
AND h.chwpart = '75'
AND h.amppart = '03'
GROUP BY vn.hospsub