Re: how to add 'time with time zone' data types and 'interval' data types

i tried select '12:00'::interval + '9:00'::interval; and worked.

but, my fields are time with time zone, because the user needs to introduce
the info in this format.

in this case, which is the correct syntax to find out how long the travel
last between two entries, f1 and f2?

select '12:00'::time - '9:00'::time; didn't work.

Johny

On 6 January 2014 20:38, Andreas Kretschmer <akretschmer(at)spamfence(dot)net>wrote:

> avpro avpro <avprowebeden(at)gmail(dot)com> wrote:
>
> > hi all,
> >
> > 1st scenario: i have a table with two fields both of them ''time with
> time
> > zone'. How could I add them? i would like to have something like: SELECT
> > table.field1 + table.field2 as sum;
>
> Add 2 TIME's? Make no sense.
>
> test=*# select '9:00'::time + '12:00'::time;
> ERROR: operator is not unique: time without time zone + time without
> time zone
> LINE 1: select '9:00'::time + '12:00'::time;
> ^
> HINT: Could not choose a best candidate operator. You might need to add
> explicit type casts.
>
>
> What about to add 23:00 and 21:00? 44:00 as TIME?
>
>
> > 2nd scenario, similar but this time data types are 'interval': i have a
> table
> > with two fields both of them ''interval'. How could I add them? i would
> like to
> > have something like: SELECT table.field1 + table.field2 as sum;
>
> Just do it:
>
> test=*# select '9:00'::interval + '12:00'::interval;
> ?column?
> ----------
> 21:00:00
> (1 row)
>
>
>
> Andreas
> --
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