PL/pgSQL Copy data from one table to another

Hey Guys,

I am trying to copy data from one table to another using plpgsql. The two
tables have different structure cause the new one is object-table. My
function is this :

CREATE OR REPLACE FUNCTION copy_customers() RETURNS integer as $BODY$
DECLARE
idcounter integer := 1;
firstname text;
lastname text;
address1 text;
address2 text;
city text;
state text;
zip text;
country text;
region text;
BEGIN
FOR idcounter In 1..20000
LOOP

-- Add the values into the variables.
SELECT
"FirstName","LastName","Address1","Address2","City","State","Zip","Country","Region"
INTO firstname, lastname,address1,address2,city,state,zip,country,region
FROM "Customers"
WHERE "CustomerId" = idcounter;

--Insert the variables to the new table.
INSERT INTO "Customers_object_table" (customerid , firstname, lastname,
address)
VALUES(idcounter,firstname,lastname,(address1,address2,city,state,zip,country,region));
END Loop;

return 1;
END;
$BODY$
LANGUAGE plpgsql;

This function is working fine, but the problem is that the table "Customers"
has more than 20 columns, so the code is ugly and unmaintainable. Also I
want to do the same job for 10 more tables.

Can somebody help me to change this function in a way that I won't have to
declare the columns?

Notice that the destination-tables are object tables and can be different
than the old tables, so I am not sure if what I ask is possible.

Kind Regards,
George Ant

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