如果要删除的字符数超过原始字符串中可用的字符数，MySQL INSERT() 函数会返回什么？

mysql> Select INSERT('myteststring',3,15,'original');

+----------------------------------------+
| INSERT('myteststring',3,15,'original') |
+----------------------------------------+
| myoriginal                             |
+----------------------------------------+

1 row in set (0.00 sec)