RE: [SQL] timespan arithmetic

I'm not certain this will work, but
try:
SELECT * FROM table
WHERE loaded_time::datetime >= now()::datetime - '1
days'::timespan
ORDER BY loaded_time DESC;

> -----Original Message-----
> From: David Rose [SMTP:David(dot)R(dot)Rose(at)disney(dot)com]
> Sent: Monday, July 26, 1999 6:01 PM
> To: pgsql-sql(at)postgreSQL(dot)org
> Subject: [SQL] timespan arithmetic
>
> Hello.
>
> I recently posted this question on pgsql-novice and received no
> answer. Undaunted, I'm trying again on pgsql-sql. Perhaps someone
> knows at least where to start looking for an answer to this problem.
> It's not in the FAQ, and I couldn't find an answer in the mailing list
> archives.
>
> I have a table that includes a column of type timestamp. I'd like to
> formulate a query that returns, say, all rows no more than 24 hours
> old, based on the timestamp. Trial and error got me this far (and a
> perusal of the mailing list archives confirmed it):
>
> SELECT * FROM table
> WHERE loaded_time >= 'now'::timestamp - '1 days'::timespan
> ORDER BY loaded_time DESC;
>
> This works fine in PostgreSQL 6.4.2. However, another user of my
> software, who has PostgreSQL 6.3.2, reports that he gets the following
> error message:
>
> ERROR: There is no operator '-' for types 'timestamp' and 'timespan'
> You will either have to retype this query using an explicit cast, or you
> will have to define the operator using CREATE OPERATOR
>
>
> So. Is there a correct solution to this problem that works for all
> versions of PostgreSQL--or at least, PostgreSQL versions 6.3.2 and
> higher? Barring that, is there at least a solution at all for 6.3.2,
> which may or may not be different from the solution for 6.4.2 and
> higher?
>
> Many thanks.
>
> David
>