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Re: Function syntax ?

From: "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com>
To: "Ruben Gouveia" <rubes7202(at)gmail(dot)com>
Cc: pgsql-sql <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Function syntax ?
Date: 2008-09-09 18:07:55
Message-ID: dcc563d10809091107m11202269p68e6fbf3be197dcb@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-sql
On Tue, Sep 9, 2008 at 11:55 AM, Ruben Gouveia <rubes7202(at)gmail(dot)com> wrote:
> Does this syntax look correct? Can anyone think of a better way to write
> this?
>
> This function will accept two timestamp parameters and determine the highest
> of the two?
>
> create or replace function fcn_max_dt(p_dt timestamp without time zone,
>                                       p_dt2 timestamp without time zone)
> returns timestamp without time zone as $$
>   DECLARE
>       v_dt timestamp without time zone;
>       v_dt2 timestamp without time zone;
>
>   BEGIN
>     v_dt := p_dt;
>     v_dt2 := p_dt2;
>
>     if v_dt >= v_dt2 then
>     return v_dt;
>     else
>     return v_dt2;
>     end if;
>
>   END;
> $$ LANGUAGE 'plpgsql';

It certainly works, but there's no real need for the declarations.
This works just as well:

create or replace function fcn_max_dt(p_dt timestamp without time zone,
                                      p_dt2 timestamp without time zone)
returns timestamp without time zone as $$

    BEGIN
    if p_dt >= p_dt2 then
    return p_dt;
    else
    return p_dt2;
    end if;

  END;
$$ LANGUAGE 'plpgsql';

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