From: Stephan Szabo <sszabo@megazone23.bigpanda.com>
To: Jan Bodey <jan_bodey@hotmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Date comparison question
Date: Tue, 20 May 2003 09:57:26 -0700 (PDT)
Message-ID: <20030520095059.Q68048-100000@megazone23.bigpanda.com> (raw)
In-Reply-To: <Law11-F4684J5kbuOAb0001655b@hotmail.com>
On Tue, 20 May 2003, Jan Bodey wrote:
> Hi
>
> I require a query that will see if a stored date is more than a certain
> interval before the current date. Using an interval of 10 hours, the query
> would be something like:
>
> SELECT * FROM utable
> WHERE now() - utimestamp > interval '10 hours';
>
> The problem I am having is that the interval is not fixed, and I would like
> to be able to store it as a value in a database table. The unit of the
> interval can, however, be fixed, and will almost certainly be fixed to
> hours.
>
> I have not been able to find a way of doing what I require, does anybody
> have any ideas to what I need to do?
If you assume that you're just going to stick one row in the interval
table, I think you can do something kinda like:
create table interv(i interval);
insert into interv values ('10 hours');
analyze interv;
select utable.* from utable, interv
where now()-utimestamp>i;
This could be made more complicated if you want to have multiple interval
values, etc. Also, neither of the above is probably terribly fast if
utable is big.
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone23.bigpanda.com, jan_bodey@hotmail.com
Subject: Re: Date comparison question
In-Reply-To: <20030520095059.Q68048-100000@megazone23.bigpanda.com>
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