Задание: 93 (Serge I: 2003-06-05)
Вывод: название компании, время в минутах.
select c.name, sum(vr.vr)
from
(select distinct t.id_comp, pt.trip_no, pt.date,t.time_out,t.time_in,--pt.id_psg,
case
when DATEDIFF(mi, t.time_out,t.time_in)> 0 then DATEDIFF(mi, t.time_out,t.time_in)
when DATEDIFF(mi, t.time_out,t.time_in)<=0 then DATEDIFF(mi, t.time_out,t.time_in+1)
end vr
from pass_in_trip pt left join trip t on pt.trip_no=t.trip_no
) vr left join company c on vr.id_comp=c.id_comp
group by c.name
