Oracle sql按字符順序排序

Question

美好的一天，也許有人可以幫助我，我想在oracle sql上獲取n select輸出，但是當我通過它訂購時不正確。

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

需要將其排序為數字，並且所有值中都有一個句號.

有任何想法嗎？？

感謝，但是我看到一些值可以包含非數字值，例如C，B等。

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

表大綱：

code_order為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'))
    ;