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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