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Re: querying the age of a row

From: "Lonni J Friedman" <netllama(at)gmail(dot)com>
To: "Sean Davis" <sdavis2(at)mail(dot)nih(dot)gov>, pgsql-novice(at)postgresql(dot)org
Subject: Re: querying the age of a row
Date: 2007-06-07 18:56:42
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Lists: pgsql-novice
On 6/7/07, Sean Davis <sdavis2(at)mail(dot)nih(dot)gov> wrote:
> Lonni J Friedman wrote:
> > Greetings,
> > I've got a PostgreSQL-8.1.x database on a Linux box.  I have a need to
> > determine which rows in a specific table are less than 24 hours old.
> > I've tried (and failed) to do this with the age() function.  From what
> > I can tell, age() only has granularity down to days, and seems to
> > assume that anything matching today's date is less than 24 hours old,
> > even if there are rows from yesterday's date that existed less than 24
> > hours ago.
> >
> > I've googled on this off and on for a few days, and have come up dry.
> > Someone on a different list suggested that I add a column that get
> > now() each time a new row is inserted, but that unfortunately won't
> > help me for all the pre-existing rows in this database.
> >
> > At any rate, is there a reliable way of querying a table for rows
> > which have existed for a specific period of time?
> >
> So your table has no date or time stored in it at all?  If not, then you
> cannot do the query that you are suggesting.

It does have a column that is populated with a date/timestamp from the
following query:
select to_char(current_timestamp, 'MM-DD-YYYY HH24:MI:SS')

L. Friedman                                    netllama(at)gmail(dot)com

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