partial time stamp query
I am trying to write a query that grabs one particular day from a timestamp column. The data are ordered in 15 minute chunks like this:
2010-07-07 12:45:00
2010-07-07 13:00:00
2010-07-07 13:15:00
2010-07-07 13:30:00
etc…
If I wanted all records from july 7th 2010, I would expect 4 x 24 = 96 records per day.
I have tried the '=' operator, like this
WHERE derived_tsoil_fifteen_min_stacked.time2 = '2010-07-07*'
but that grabs nothing, and using the '~' operator grabs everything with a 2010 or 07 in it… in other words all days from July of 2010.
Any suggestions would be much appreciated.
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On Mon, Feb 4, 2013 at 9:45 AM, Kirk Wythers <kirk.wythers@gmail.com> wrote:
I am trying to write a query that grabs one particular day from a
timestamp column. The data are ordered in 15 minute chunks like this:2010-07-07 12:45:00
2010-07-07 13:00:00
2010-07-07 13:15:00
2010-07-07 13:30:00
etc…WHERE derived_tsoil_fifteen_min_stacked.time2 = '2010-07-07*'
but that grabs nothing
Just cast the timestamp to a date before you compare it:
WHERE derived_tsoil_fifteen_min_stacked.time2::date = '2010-07-07'
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Moshe Jacobson
Nead Werx, Inc. | Manager of Systems Engineering
2323 Cumberland Parkway, Suite 201 | Atlanta, GA 30339
moshe@neadwerx.com | www.neadwerx.com
"People don't multitask because they're good at it. They do it because they
are more distracted" -- David
Sanbonmatsu<http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0054402>