Re: Dynamic Query for System functions - now()

Dear Christoph Haller,

The code that u sent is not working
test=> EXECUTE 'select now()+ interval\'' ||to_char(3,'9')|| 'month\'';
ERROR:  parser: parse error at or near "'select now()+ interval\''" at
character 9
test=>

Also I tried just to run the now() function with a dynamic query, I got the
following error. Please correct me.

test=> select now();             now
-------------------------------2003-11-10 17:06:36.783779+00
(1 row)

test=> execute 'select now()';
ERROR:  parser: parse error at or near "'select now()'" at character 9
test=>


Regards
kumar

----- Original Message ----- 
From: "Christoph Haller" <ch@rodos.fzk.de>
To: ""Kumar"" <sgnerd@yahoo.com.sg>
Cc: <pgsql-sql@postgresql.org>
Sent: Monday, November 10, 2003 5:07 PM
Subject: Re: [SQL] Dynamic Query for System functions - now()


> >
> > Dear Friends,
> >
> > I am using PostgreSQL 7.3.4 Server on RH Linux 7.2. I am trying to
generate=
> >  a dynamic query to fetch the next month interval.
> >
> > select now()+ interval'1 month';  -- This is working fine.
> >
> > I wanna dynamically assign the interval number. i,e --> select now()+
inter=
> > val'n month';
> >
> > For this I wanted to write a dynamic query.
> > EXECUTE 'select now()+ interval\'' || 3|| 'month\'';
> > Error
> >     ERROR:  parser: parse error at or near "'select now()+ interval\''"
at =
> > character 9
> >
> > Help help me with this. I wanted to use this query inside a PLpgSQL
functio=
> > n.
> >
> > Regards
> > Kumar
> >
> You'd probably want to use the to_char() function like this
> EXECUTE 'select now()+ interval\'' ||to_char(3,'9')|| 'month\'';
>
> The || operator is the string concatination operator.
>
> Regards, Christoph