Getting all parent rows in one SQL query

Posted by Alex on Stack Overflow See other posts from Stack Overflow or by Alex
Published on 2010-03-14T10:24:46Z Indexed on 2010/03/14 10:35 UTC
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I have a simple MySQL table thats contains a list of categories, level is determined by parent_id:

id  name    parent_id
---------------------------
1   Home        0
2   About       1
3   Contact     1
4   Legal       2
5   Privacy     4
6   Products    1
7   Support     1

I'm attempting to make a breadcrumb trail. So i have the 'id' of the child, I want to get all available parents (iterating up the chain until we reach 0 "Home"). There could be any number or child rows going to an unlimited depth.

Currently I am using an SQL call for each parent, this is messy. Is there a way in SQL to do this all on one query?

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