select mlogin, mprenom, mnom,  truncate(sum(vpduree) / 60, 0) as heures, truncate(sum(vpduree), 0) % 60 as minutes, count(vpduree) as vols  from membres, volsp where ((mniveaux & 65536 + 32768) <> 0) and vpdc = 0 and membres.mlogin = volsp.vppilid and vpdate >= '2013-01-01' and vpdate <= '2013-12-31' group by mlogin