Re: absolute value fro timestamps

Claudio Lapidus wrote:
> Hello
>
> Evidently is possible to have a negative time interval:
>
> clapidus=> select interval '-1';
> interval
> -----------
> -01:00:00
>
> However, there seems to be no provision to get the absolute value in such
> case:
>
> clapidus=> select @ interval '-1';
> ERROR: operator does not exist: @ interval
> HINT: No operator matches the given name and argument type(s). You may need
> to add explicit typecasts.
>
> clapidus=> select abs(interval '-1');
> ERROR: function abs(interval) does not exist
> HINT: No function matches the given name and argument types. You may need
> to add explicit typecasts.
>
> What did I miss this time?

Why would you want an abolute value of a negative interval?

This works:

test=> select -(interval '-1');
?column?
----------
01:00:00
(1 row)

so I suppose you could create a function or CASE statement to get the
absolute value.

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