postgres=# CREATE FUNCTION "triple_price" (double precision) RETURNS double precision AS '
postgres'# DECLARE
postgres'# -- Declare input_price as an alias for the
postgres'# -- argument variable normally referenced with
postgres'# -- the $1 identifier.
postgres'# input_price ALIAS FOR $1;
postgres'#
postgres'# BEGIN
postgres'# -- Return the input price multiplied by three.
postgres'# RETURN input_price * 3;
postgres'# END;
postgres'# ' LANGUAGE 'plpgsql';
CREATE FUNCTION
postgres=#
postgres=#
postgres=# select triple_price(100);
triple_price
--------------
300
(1 row)
postgres=#