and I have a simple query that fails
This is not failure, this is a query that found zero matching records.
Ie
SELECT sensor_id, MAX(ts), date_trunc('day', ts), COALESCE(MAX(value),
'NaN')::float FROM sensor_values_days WHERE ts > '2017-10-06
00:01:01+00' AND ts < '2017-10-06 23:59:59+00' GROUP BY 1, 3 ORDER BY
1, 2;
sensor_id | max | date_trunc | coalesce
-----------+-----+------------+----------
(0 rows)
If I remove the timezone part of the start date I get results.
Ie
ts > '2017-10-06 00:01:01'
597551 | 2017-10-06 01:00:00+01 | 2017-10-06 00:00:00+01 | 13763
I'm sure I am doing something silly but can't see what.
Does anyone know what is going on here ?
The "max(ts)" result indicates a time of midnight, the 6th, GMT
ts > '2017-10-06 00:01:01+01' equates to > '2017-10-05 23:01:01+00' of which midnight, the 6th, GMT is indeed more recent
ts > '2017-10-06 00:01:01+00' is 12:01:01 on the 6th, GMT, of which midnight GMC, the 6th is NOT more recent
David J.
