SQL> select to_char(11,'0x') from dual;TO_
---
0bSQL> select to_char(111111,'00000x') from dual;TO_CHAR
-------
01b207
---
0bSQL> select to_char(111111,'00000x') from dual;TO_CHAR
-------
01b207
-----
12SQL> select to_number('12','XXXX') from dual;TO_NUMBER('12','XXXX')
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18你用的是什么版本?