select actuator, state, min(actuator_time), max(actuator_time)
from (select t.*,
row_number() over (partition by actuator order by actuator_time) as seqnum,
row_number() over (partition by actuator, state order by actuator_time) as seqnum_s
from t
) t
group by actuator, (seqnum- seqnum_s)
For the maximum per actuator, use distinct on:
select distinct on (actuator) actuator, state, min(actuator_time), max(actuator_time)
from (select t.*,
row_number() over (partition by actuator order by actuator_time) as seqnum,
row_number() over (partition by actuator, state order by actuator_time) as seqnum_s
from t
) t
group by actuator, (seqnum- seqnum_s)
order by actuator, max(actuator_time) - min(actuator_time) desc;
这是一个悬而未决的问题。您的数据有点难以理解,但我认为:
For the maximum per actuator, use
distinct on
: