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Time histogram helper function
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CREATE OR REPLACE FUNCTION time_histogram( | |
start_time timestamp, | |
end_time timestamp | |
) | |
RETURNS TABLE(bucket timestamp) AS $$ | |
DECLARE diff_hours int; | |
BEGIN | |
diff_hours = abs(extract(epoch from end_time - start_time) / 3600) | |
raise notice 'diff hours: ', diff_hours; | |
if diff_hours <= 1 then | |
select generate_series( | |
date_trunc('minute', start_time), | |
date_trunc('minute', end_time), | |
'1 minute'::interval | |
) as bucket | |
; | |
else if diff_hours <= 24 then | |
select generate_series( | |
date_trunc('minute', start_time), | |
date_trunc('minute', end_time), | |
'15 minutes'::interval | |
) as bucket | |
; | |
else if diff_hours <= (24 * 7) then | |
select generate_series( | |
date_trunc('hour', start_time), | |
date_trunc('hour', end_time), | |
'1 hour'::interval | |
) as bucket | |
; | |
end if; | |
END; | |
$$ LANGUAGE psql; | |
select * from time_histogram( | |
'2020-04-06 08:30:46.85378'::timestamp, | |
'2020-12-08 15:04:00.516976'::timestamp | |
); | |
drop function if exists time_histogram; |
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