Table name as a variable in SELECT query - Mailing list pgsql-sql

Hi,
please advise is possible in SELECT query use variable as a table name?

I would like to have  for example something like:

CREATE OR REPLACE FUNCTION test_name (tb varchar) RETURNS int AS  $$

DECLARE
                ......

BEGIN    SELECT * FROM $1;    ........

Will be grateful for any idea about.


Best regards           Andrey