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Re: Function syntax ?

From: "Ruben Gouveia" <rubes7202(at)gmail(dot)com>
To: "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com>
Cc: pgsql-sql <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Function syntax ?
Date: 2008-09-09 18:16:02
Message-ID: 51e507b0809091116tc41786codba24813a7951ee0@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-sql
thanks pavel...that worked! I like the simplicity of your first suggestion.

On Tue, Sep 9, 2008 at 11:05 AM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>wrote:

> try
>
> create or replace function fcn_max_dt(p_dt timestamp without time zone,
>                                       p_dt2 timestamp without time zone)
> returns imestamp without time zone as $$
> select greatest($1,$2);
> $$ language sql;
>
> or
>
> begin
>  return greatest(p_dt, p_dt2);
> end;
> $$ language plpgsql;
>
> or
> begin
>  if p_dt > p_dt2 then
>    return p_dt;
>  else
>    return p_dt2;
>  end if;
> end;
> $$ language sql;
>
> plpgsql is scripting language and almost is better minimalize number
> of statements in function.
>
> Regards
> Pavel Stehule
>
> 2008/9/9 Ruben Gouveia <rubes7202(at)gmail(dot)com>:
> > 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';
> >
> >
> >
>

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