[SQL] getting extract to always return number of hours
Hi,
I'm trying to get extract() to always return the number of hours between
two time intervals, ala:
=> create table t1(timestart timestamp, timeend timestamp);
=> insert into t1(timestart, timeend) values ('2010-01-01 00:00:00',
'2010-01-02 01:00:00');
=> select timeend - timestart from t1;
?column?
1 day 01:00:00
(1 row)
to return 25 hours.
I couldn't see anything in the docs and can't work out a way to do it.
Any suggestions?
Thanks!
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Re: [SQL] getting extract to always return number of hours
On Tue, Jan 5, 2010 at 6:33 PM, Chris wrote: > I'm trying to get extract() to always return the number of hours between two > time intervals, ala: SELECT extract(epoch from timeend - timestart) / 3600 from t1; rls -- :wq -- Sent via pgsql-sql mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] getting extract to always return number of hours
Chris wrote:
Hi,
I'm trying to get extract() to always return the number of hours between
two time intervals, ala:
=> create table t1(timestart timestamp, timeend timestamp);
=> insert into t1(timestart, timeend) values ('2010-01-01 00:00:00',
'2010-01-02 01:00:00');
=> select timeend - timestart from t1;
?column?
1 day 01:00:00
(1 row)
to return 25 hours.
I ended up with
select extract('days' from x) * 24 + extract('hours' from x) from
(select (timeend - timestart) as x from t1) as y;
mainly because t1 is rather large so I didn't want to run the end -
start calculation multiple times.
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