Re: absolute value fro timestamps

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От Bruce Momjian
Тема Re: absolute value fro timestamps
Дата
Msg-id 200309032113.h83LDjc28519@candle.pha.pa.us
обсуждение исходный текст
Ответ на absolute value fro timestamps  ("Claudio Lapidus" <clapidus@hotmail.com>)
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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.

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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