CALL nonexistent();  -- error
ERROR:  function nonexistent() does not exist
LINE 1: CALL nonexistent();
             ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
CALL random();  -- error
ERROR:  random() is not a procedure
LINE 1: CALL random();
             ^
HINT:  To call a function, use SELECT.
CREATE FUNCTION testfunc1(a int) RETURNS int LANGUAGE SQL AS $$ SELECT a $$;
CREATE TABLE cp_test (a int, b text);
CREATE PROCEDURE ptest1(x text)
LANGUAGE SQL
AS $$
INSERT INTO cp_test VALUES (1, x);
$$;
SELECT ptest1('x');  -- error
ERROR:  ptest1(unknown) is a procedure
LINE 1: SELECT ptest1('x');
               ^
HINT:  To call a procedure, use CALL.
CALL ptest1('a');  -- ok
\df ptest1
                        List of functions
 Schema |  Name  | Result data type | Argument data types | Type 
--------+--------+------------------+---------------------+------
 public | ptest1 |                  | x text              | proc
(1 row)

SELECT * FROM cp_test ORDER BY a;
 a | b 
---+---
 1 | a
(1 row)

CREATE PROCEDURE ptest2()
LANGUAGE SQL
AS $$
SELECT 5;
$$;
CALL ptest2();
-- various error cases
CALL version();  -- error: not a procedure
ERROR:  version() is not a procedure
LINE 1: CALL version();
             ^
HINT:  To call a function, use SELECT.
CALL sum(1);  -- error: not a procedure
ERROR:  sum(integer) is not a procedure
LINE 1: CALL sum(1);
             ^
CREATE PROCEDURE ptestx() LANGUAGE SQL WINDOW AS $$ INSERT INTO cp_test VALUES (1, 'a') $$;
ERROR:  invalid attribute in procedure definition
LINE 1: CREATE PROCEDURE ptestx() LANGUAGE SQL WINDOW AS $$ INSERT I...
                                               ^
CREATE PROCEDURE ptestx() LANGUAGE SQL STRICT AS $$ INSERT INTO cp_test VALUES (1, 'a') $$;
ERROR:  invalid attribute in procedure definition
LINE 1: CREATE PROCEDURE ptestx() LANGUAGE SQL STRICT AS $$ INSERT I...
                                               ^
CREATE PROCEDURE ptestx(OUT a int) LANGUAGE SQL AS $$ INSERT INTO cp_test VALUES (1, 'a') $$;
ERROR:  procedures cannot have OUT parameters
ALTER PROCEDURE ptest1(text) STRICT;
ERROR:  invalid attribute in procedure definition
LINE 1: ALTER PROCEDURE ptest1(text) STRICT;
                                     ^
ALTER FUNCTION ptest1(text) VOLATILE;  -- error: not a function
ERROR:  ptest1(text) is not a function
ALTER PROCEDURE testfunc1(int) VOLATILE;  -- error: not a procedure
ERROR:  testfunc1(integer) is not a procedure
ALTER PROCEDURE nonexistent() VOLATILE;
ERROR:  procedure nonexistent() does not exist
DROP FUNCTION ptest1(text);  -- error: not a function
ERROR:  ptest1(text) is not a function
DROP PROCEDURE testfunc1(int);  -- error: not a procedure
ERROR:  testfunc1(integer) is not a procedure
DROP PROCEDURE nonexistent();
ERROR:  procedure nonexistent() does not exist
-- privileges
CREATE USER regress_user1;
GRANT INSERT ON cp_test TO regress_user1;
REVOKE EXECUTE ON PROCEDURE ptest1(text) FROM PUBLIC;
SET ROLE regress_user1;
CALL ptest1('a');  -- error
ERROR:  permission denied for procedure ptest1
RESET ROLE;
GRANT EXECUTE ON PROCEDURE ptest1(text) TO regress_user1;
SET ROLE regress_user1;
CALL ptest1('a');  -- ok
RESET ROLE;
-- ROUTINE syntax
ALTER ROUTINE testfunc1(int) RENAME TO testfunc1a;
ALTER ROUTINE testfunc1a RENAME TO testfunc1;
ALTER ROUTINE ptest1(text) RENAME TO ptest1a;
ALTER ROUTINE ptest1a RENAME TO ptest1;
DROP ROUTINE testfunc1(int);
-- cleanup
DROP PROCEDURE ptest1;
DROP PROCEDURE ptest2;
DROP TABLE cp_test;
DROP USER regress_user1;