Re: variable scooping - Mailing list pgsql-sql

From Michael Fuhr
Subject Re: variable scooping
Date
Msg-id 20060130042424.GA56410@winnie.fuhr.org
Whole thread Raw
In response to variable scooping  (ody quraviharto <odyyudah@gmail.com>)
List pgsql-sql
On Mon, Jan 30, 2006 at 09:01:37AM +0700, ody quraviharto wrote:
> "declare tbl_name varchar:='tbl_A';
> begin
>         if exists(select 1 from pg_tables where tablename=tbl_name) then
>         select count(*) from tbl_name;
>         end if;
> end"
> 
> the message was: syntax error in $1 in "select count(*) from $1".

You'll need to use EXECUTE for this query; see "Executing Dynamic
Commands" in the PL/pgSQL documentation.  Here's the link for 8.1
(but use the documentation for whatever version you're running):

http://www.postgresql.org/docs/8.1/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN

-- 
Michael Fuhr


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