MySQL根据父ID排序类别(mysql sort category according to parent id)

This is the table structure

id   parent_id   name
1    0           BMW
2    0           Mercedez
3    0           Porsche
4    1           3 Series
5    2           E60
6    1           5 Series
7    3           Cayenne

How can i show the table as

BMW
3 Series
5 Series
Mercedez
E60
Porsche
Cayenne 

The above table shows ascending id followed by parent_id associated with that id, then go to second id and so on. I need in a single query, is it possible to do as such?

Try this:

SELECT
  name,
  CASE WHEN parent_id = 0 THEN id ELSE parent_id END AS Sort
FROM
  cars
ORDER BY
  Sort,
  id

http://sqlfiddle.com/#!2/9b05f/3

EDIT:

Given that this answer keeps getting upvotes, I revisited the question and found a flaw. If, for some reason, the parent has a higher ID than the child, the ordering gets messed up. The above query only works if the parent ID is a lower number than all the children.

To demonstrate the problem, imagine the table looked like this:

id   parent_id   name
8    0           BMW
2    0           Mercedez
3    0           Porsche
4    8           3 Series
5    2           E60
6    8           5 Series
7    3           Cayenne

Notice now that BMW has an id of 8 instead of 1. The result will look like this:

Mercedez
E60
Porsche
Cayenne
3 Series
5 Series
BMW

Notice above that BMW shows up at the bottom of the list, after its children! This is because the secondary sorting orders by id, and if the parent ID happens to be higher than any children, the parent may not show up on top of the children.

This query will solve that problem:

SELECT
  name
FROM
  cars
ORDER BY
  CASE WHEN parent_id = 0 THEN id ELSE parent_id END, -- another way of writing it: ISNULL(NULLIF(parent_id, 0), id)
  parent_id,
  id