Re: Timestamp/hstore query?

If you share example schema and desired output (like a dummy table or even
pseudo code SQL), then I'm sure many people could help you. Right now, the
description of your desired result seems a bit unclear, at least to me.

If you wanted to run this hourly for the last 1 hour, it sounds a bit like
want this-

select sensor_id, date_trunc( 'minute', timestamptz_field_name_here ),
last( value_from_hstore ) over ( partition by sensor_id, date_trunc(
'minute', timestamptz_field_name_here ) ) as last_value_recorded
from data_table_here
where timestamptz_field_name_here BETWEEN NOW() - interval '1 hour' and
NOW()
group by sensor_id, date_trunc( 'minute', timestamptz_field_name_here )

You could also use the left join "where is null" pattern to check that a
prior record in the minute period of time does not exist for that same key.
Something like this-

select d1.sensor_id, date_trunc( 'minute', d1.timestamptz_field_name_here
), d1.timestamptz_field_name_here as last_value_recorded
from data_table_here as d1
left join data_table_here as prior_d1 ON prior_d1.sensor_id = d1.sensor_id
AND prior_d1.timestamptz_field_name_here < d1.timestamptz_field_name_here
and prior_d1.timestamptz_field_name_here >= date_trunc( 'minute',
d1.timestamptz_field_name_here )
where d1.timestamptz_field_name_here BETWEEN NOW() - interval '1 hour' and
NOW()