MariaDB [test]> values (1), (2), () ;

ERROR 4099 (HY000): The used table value constructor has a different number of values

MariaDB [test]> values (1), (((2))), (1) ;

+---+

| 1 |

+---+

| 1 |

| 2 |

| 1 |

+---+

3 rows in set (0.000 sec)

MariaDB [test]> values (1), (((2))), (()) ;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '))' at line 1