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Re: Simple query fail

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On Tue, Oct 17, 2017 at 2:29 PM, Glenn Pierce <glennpierce@xxxxxxxxx> wrote:
 
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.


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