Goran Hasse wrote:
Hello all!
I am logging my electricity meeter every five minute!
But the problem is that I would like to get values *just before* every
hour - like
select * from counter_log_view where name='CNT-3' and timestamp <
'2010-05-23 22:00:00' order by timestamp desc limit 1;
name | timestamp | count
-------+----------------------------+-------
CNT-3 | 2010-05-23 21:53:20.844422 | 69
(1 rad)
But I don't want to do a lot of selections and gather all the data in
a file.
Is there any better way to create the query so that I get the values
just before
every hour?
wild guess, untested.. something like...
select * from counter_log_view where name = 'CNT-3' and extract(minute
from timestamp) >= 55 order by timestamp;
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