Oracle sql按字符顺序排序

Question

美好的一天，也许有人可以帮助我，我想在oracle sql上获取n select输出，但是当我通过它订购时不正确。

code_order
1.
2.
2.1
3.
4.2
10.1
10.0
21.
21.1
23.
31.

需要将其排序为数字，并且所有值中都有一个句号.

有任何想法吗？？

感谢，但是我看到一些值可以包含非数字值，例如C，B等。

1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 7C。 40. 50. 51. 6。

表大纲：

code_order为varchar2

Answer 1

使用order by to_number(code_order)

Answer 2

    with
    val as
    (
      SELECT '1.' as c FROM dual
      union all
      SELECT '2.' as c FROM dual
      union all
      SELECT '3.' as c FROM dual
      union all
      SELECT '2.1' as c FROM dual
      union all
      SELECT '4.2' as c FROM dual
      union all
      SELECT '10.1' as c FROM dual
      union all
      SELECT '21.' as c FROM dual
      union all
      SELECT '10.0' as c FROM dual
      union all
      SELECT '21.1' as c FROM dual
      union all
      SELECT '23.' as c FROM dual
      union all
      SELECT '31.' as c FROM dual
    )
SELECT c FROM val
order by to_number(regexp_replace(c, '^(\d+)\..*$', '\1'))
    ;