sql select first and last record of each group

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Felix
23 Jan 2018
1select v.*
2from (select v.*,
3             row_number() over (partition by vehicleid, tripid order by datetime asc) as seqnum_asc,
4             row_number() over (partition by vehicleid, tripid order by datetime desc) as seqnum_desc
5      from vehicles v
6     ) v
7where seqnum_asc = 1 or seqnum_desc = 1;
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