postgresql - sql delete based on group by -


i have following query:

select user_id, trajectory_id, count(trajectory_id) point group user_id, trajectory_id

it returns following result: enter image description here

and want delete records point table count in produced table < 5.

right have following query, not compiling. wrong , how can fix it?

delete  point count(trajectory_id) < 5 group user_id, trajectory_id

i using postgres.

delete p1 point p1 join (   select user_id, trajectory_id    point    group user_id, trajectory_id   having count(trajectory_id) < 5 ) p2 on p1.user_id = p2.user_id     , p1.trajectory_id = p2.trajectory_id

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