DROP DATABASE IF EXISTS mcs16_db;
CREATE DATABASE mcs16_db;
USE mcs16_db;
CREATE TABLE t1(x INT, y CHAR(10))ENGINE=Columnstore;
INSERT INTO t1 VALUES(1,'aaaaa'),(100,'bbbbbb'),(100,'ccccccc'),(300,'ddddddd');
CREATE FUNCTION f1(z INT) RETURNS INT DETERMINISTIC 
RETURN (SELECT x FROM t1 WHERE x = z);
CREATE FUNCTION f2(z INT) RETURNS INT DETERMINISTIC
RETURN (SELECT * FROM t1 WHERE x = z);
SELECT f1(1);
f1(1)
1
SELECT f1(300);
f1(300)
300
SELECT f1(11);
f1(11)
NULL
SELECT f1();
ERROR 42000: Incorrect number of arguments for FUNCTION mcs16_db.f1; expected 1, got 0
SELECT f1(100);
ERROR 21000: Subquery returns more than 1 row
SELECT f2(1);
ERROR 21000: Operand should contain 1 column(s)
DROP FUNCTION f1;
DROP FUNCTION f2;
DROP FUNCTION f2;
ERROR 42000: FUNCTION mcs16_db.f2 does not exist
CREATE FUNCTION f3(i INT) RETURNS INT DETERMINISTIC
BEGIN
INSERT INTO t2 VALUES(i+1);
RETURN 42;
END //
CREATE TABLE t2(col1 INT)ENGINE=Columnstore;
SELECT f3(a);
ERROR 42S22: Unknown column 'a' in 'field list'
SELECT f3(123);
f3(123)
42
SELECT f3(86);
f3(86)
42
SELECT f3(07);
f3(07)
42
SELECT * FROM t2;
col1
124
87
8
DROP FUNCTION f3;
CREATE FUNCTION func1() RETURNS INT COMMENT 'comment for func1' LANGUAGE SQL DETERMINISTIC CONTAINS SQL SQL SECURITY DEFINER
BEGIN
RETURN 1;
END//
SHOW CREATE FUNCTION func1;
Function	sql_mode	Create Function	character_set_client	collation_connection	Database Collation
func1	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` FUNCTION `func1`() RETURNS int(11)
    DETERMINISTIC
    COMMENT 'comment for func1'
BEGIN
RETURN 1;
END	latin1	latin1_swedish_ci	latin1_swedish_ci
SELECT func1();
func1()
1
CREATE FUNCTION func2() RETURNS CHAR(10) COMMENT 'comment for func2' LANGUAGE SQL NOT DETERMINISTIC NO SQL SQL SECURITY INVOKER
BEGIN
RETURN 'func2';
END//
SHOW CREATE FUNCTION func2;
Function	sql_mode	Create Function	character_set_client	collation_connection	Database Collation
func2	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` FUNCTION `func2`() RETURNS char(10) CHARSET latin1
    NO SQL
    SQL SECURITY INVOKER
    COMMENT 'comment for func2'
BEGIN
RETURN 'func2';
END	latin1	latin1_swedish_ci	latin1_swedish_ci
SELECT func2();
func2()
func2
DROP DATABASE mcs16_db;