Using the WHILE loop : While « Postgre SQL « PostgreSQL

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Using the WHILE loop

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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