MariaDB [test]> CREATE TABLE `bork` (`a` INT, `b` INT, PRIMARY KEY (`a`), KEY (`b`));

Query OK, 0 rows affected (0.112 sec)

MariaDB [test]> DELETE FROM bork WHERE `a`=1 or `b`=2;

ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column

-- 0xFFFFFFFFFFFFFFFE : (2 ^ 64) - 2

MariaDB [test]> DELETE FROM bork WHERE `a`=1 or `b`=2 LIMIT 18446744073709551614;

Query OK, 0 rows affected (0.000 sec)

-- 0xFFFFFFFFFFFFFFFF : (2 ^ 64) - 1

MariaDB [test]> DELETE FROM bork WHERE `a`=1 or `b`=2 LIMIT 18446744073709551615;

ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column

-- 0x10000000000000000 : (2 ^ 64)

MariaDB [test]> DELETE FROM bork WHERE `a`=1 or `b`=2 LIMIT 18446744073709551616;

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 '18446744073709551616' at line 1