MYSQL选择与自身和顺序的关系

Question

我有下表

class ChildB : BaseChild<ChildB> { }

// Ok here
var instance = new ChildB(); 

如何选择列问题，以便将其排序为：

id | parent | question
---------------------------------
1  | 0      | Question 1
2  | 0      | Question 2
3  | 2      | SubQuestion 2
4  | 0      | Question 3
5  | 2      | SubQuestion 2

有没有办法？

Answer 1

Order by case when parent = 0 then id else parent end, id

fiddle