父子 sql 表显示为 php 中的表

Question

I have table structure like this:

ID    Name     ParentId
-------------------------
1     Root      0
2     Business  1
3     Finance   2
4     Stock     3
5     Any       3
6     One       0
7     Two       6

Is there any way to get all relation in one line?

Like this:

+------------------------------------------------------------------------------------+
|ID        | NAME       |    ID     | NAME      | ID       | NAME    | ID     | NAME |
|----------|------------|-----------|-----------|----------|---------|--------|------|
| 1        | Root       | 2         | Business  | 3        | Finance | 4      | Stock|
| 1        | Root       | 2         | Business  | 3        | Finance | 4      | Any  |     
| 1        | One        | 6         | Two       |          |         |        |      |

Answer 1

Assuming your table has a name "htable" and as soon as there are up to FOUR (4) levels of hierarchy, it can be done like that using self join:

SELECT  level1.ID, level1.Name,
        level2.ID, level2.Name,
        level3.ID, level3.Name,
        level4.ID, level4.Name
FROM htable AS level1
LEFT JOIN htable AS level2 ON level1.ID = level2.ParentId
LEFT JOIN htable AS level3 ON level2.ID = level3.ParentId
LEFT JOIN htable AS level4 ON level3.ID = level4.ParentId;

Answer 2

SELECT  level1.ID, level1.Name,
        level2.ID, level2.Name,
        level3.ID, level3.Name,
        level4.ID, level4.Name
FROM htable AS level1
LEFT JOIN htable AS level2 ON level1.ID = level2.ParentId
LEFT JOIN htable AS level3 ON level2.ID = level3.ParentId
LEFT JOIN htable AS level4 ON level3.ID = level4.ParentId;

This query returns unnecessary NULLS, I only need the red squared rows to print.

Image below.

returned values