MySQL query to order by parent then child places

Posted by Swanny on Stack Overflow See other posts from Stack Overflow or by Swanny
Published on 2009-08-15T11:38:18Z Indexed on 2010/04/10 21:23 UTC
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php

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sql

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mysql

I have a table of pages in my database, each page can have a parent as below:

id            parent_id            title
1             0                    Home
2             0                    Sitemap
3             0                    Products
4             3                    Product 1
5             3                    Product 2
6             4                    Product 1 Review Page

What would be the best MySQL query to select all pages ordered by parent then child then child again if there is more than one level, there will be a maximum of three levels. The above example would produce the desired order:

Home
Sitemap
Products
    Product 1
        Product 1 Review Page
    Product 2

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