CODE EXAMPLE FOR SQL

sql select first and last record of each group

select v.*
from (select v.*,
             row_number() over (partition by vehicleid, tripid order by datetime asc) as seqnum_asc,
             row_number() over (partition by vehicleid, tripid order by datetime desc) as seqnum_desc
      from vehicles v
     ) v
where seqnum_asc = 1 or seqnum_desc = 1;