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Re: TIME column manipulation/comparison hangups

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In response to "Scott Marlowe" <scott.marlowe@xxxxxxxxx>:

> On Mon, Nov 3, 2008 at 12:01 PM, Bill Moran
> <wmoran@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > I'm trying to test the time in a time column to see if it's the same
> > minute as the current time.  I wouldn't have thought this would be
> > difficult:
> >
> > WHERE TO_CHAR(now(), 'HH24MI') = TO_CHAR(time_column, 'HH24MI')
> 
> Use date_trunc
> 
> where date_trunc('minute',timefield)=date_trunc('minute',now());
> 
> I might have the args backwards.

Hunh ...

# select date_trunc('minute','13:45:15'::time);
     date_trunc     
--------------------
 @ 13 hours 45 mins
(1 row)

# select date_trunc('minute','13:45:15'::time with time zone);
ERROR:  function date_trunc(unknown, time with time zone) does not exist
LINE 1: select date_trunc('minute','13:45:15'::time with time zone);
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.

# select date_trunc('minute',('13:45:15'::time with time zone)::time);
     date_trunc     
--------------------
 @ 13 hours 45 mins
(1 row)

Curiouser and curiouser ...

-- 
Bill Moran
Collaborative Fusion Inc.
http://people.collaborativefusion.com/~wmoran/

wmoran@xxxxxxxxxxxxxxxxxxxxxxx
Phone: 412-422-3463x4023

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