基数必须大于 2 且小于 36，即基数的下限为 2，上限为 36。它适用于 from_base 和 to_base 值。如果我们提供的值超出了基数的限制，那么 MySQL 将返回 NULL 作为输出。以下示例将演示它 -
示例
mysql> Select CONV(10,10,38); +----------------+ | CONV(10,10,38) | +----------------+ | NULL | +----------------+ 1 row in set (0.00 sec) mysql> Select CONV(10,72,2); +---------------+ | CONV(10,72,2) | +---------------+ | NULL | +---------------+ 1 row in set (0.00 sec) mysql> Select CONV(10,10,1); +---------------+ | CONV(10,10,1) | +---------------+ | NULL | +---------------+ 1 row in set (0.00 sec)
