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postgres=#
postgres=#
postgres=# -- Using the WHILE loop
postgres=#
postgres=# CREATE FUNCTION add_two_loop (integer, integer) RETURNS integer AS '
postgres'# DECLARE
postgres'# -- Declare aliases for function arguments.
postgres'# low_number ALIAS FOR $1;
postgres'# high_number ALIAS FOR $2;
postgres'#
postgres'# -- Declare a variable to hold the result.
postgres'# result INTEGER = 0;
postgres'#
postgres'# BEGIN
postgres'# -- Add one to the variable result until the value of result is
postgres'# -- equal to high_number.
postgres'# WHILE result != high_number LOOP
postgres'# result := result + 1;
postgres'# END LOOP;
postgres'#
postgres'# RETURN result;
postgres'# END;
postgres'# ' LANGUAGE 'plpgsql';
ERROR: function "add_two_loop" already exists with same argument types
postgres=#
postgres=# select add_two_loop(1,20);
add_two_loop
--------------
20
(1 row)
postgres=#
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