Re: I need a SQL...

Yes, I am sure, I just use copy-and-paste and I have double checked....
I am running on 7.3.4 but that shouldn't make any difference?

BTJ

On Thu, 2003-09-11 at 14:56, Mattias Kregert wrote:
> When i run it, it works as intended (on pg 7.3.3). Which version do you use?
>
> Are you absolutely sure you copied it exactly? You typed in '>=' and not '=', right?
>
> /Mattias
>
> ----- Original Message -----
> From: "Bjørn T Johansen" <btj@havleik.no>
> To: "Mattias Kregert" <mattias@kregert.se>
> Cc: <pgsql-general@postgresql.org>
> Sent: Thursday, September 11, 2003 3:02 PM
> Subject: Re: [GENERAL] I need a SQL...
>
>
> > Well, it's close... :)
> >
> > But it looks like the case doesn't work..
> > If I run your sql, the timediff is negative.
> >
> > But if I run this:
> > SELECT (stoptime-starttime+'24 hours') as timediff FROM mytable
> > the timediff has correct value..
> >
> > Do you see any error in the case, cause I don't?
> >
> >
> > BTJ
> >
> > On Thu, 2003-09-11 at 14:29, Mattias Kregert wrote:
> > > Solution:
> > >
> > > SELECT starttime, stoptime, (CASE WHEN stoptime-starttime >= 0 THEN
> > > stoptime-starttime ELSE stoptime-starttime+'24 hours' END) as timediff
> > > FROM mytable;
> > >
> > > /Mattias
> > >
> > >         ----- Original Message -----
> > >         From: Bjørn T Johansen
> > >         To: Andrew L. Gould
> > >         Cc: PostgreSQL general list
> > >         Sent: Thursday, September 11, 2003 2:12 PM
> > >         Subject: Re: [GENERAL] I need a SQL...
> > >
> > >         On Thu, 2003-09-11 at 14:07, Andrew L. Gould wrote:
> > >         > On Thursday 11 September 2003 06:25 am, Bjørn T Johansen wrote:
> > >         > > I need to write a SQL that calculates the interval between a start time
> > >         > > and a stop time. This is the easy part. The problem is that I only have
> > >         > > the time part, i.e. no date, so how can I be sure to also calculate the
> > >         > > interval if the start time is before midnight and the stop time is after
> > >         > > midnight?
> > >         > >
> > >         > >
> > >         > > Regards,
> > >         > >
> > >         > > BTJ
> > >         >
> > >         > If the activity or period you are measuring can equal or exceed 12 hours, you
> > >         > won't be able to calculate it reliably without a start date and a stop date.
> > >         > If the periods are always less than 12 hours (and you assume all the data is
> > >         > good), then stop times that are less than start times would indicate an
> > >         > intervening midnight.
> > >         >
> > >         > The dates do not have to be in the same fields as the times, since you can add
> > >         > date and time data to create a timestamp for datetime calculations:
> > >         >
> > >         > (stop_date + stop_time) - (start_date + start_time)
> > >         >
> > >         > Best of luck,
> > >         >
> > >         > Andrew Gould
> > >
> > >
> > >
> > >         Yes, the period can exceed 12 hours, so what you are saying is that this is not possible to solve
> > >         without the date part? I can write this logic in my business logic but I was hoping to
> > >         solve this in my database layer...
> > >
> > >
> > >         BTJ
> >
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 4: Don't 'kill -9' the postmaster
> >
--
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