From: Peter Brawley
Date: May 18 2006 7:42pm
Subject: Re: Recursive query
List-Archive: http://lists.mysql.com/mysql/198067
Message-Id: <446CCE3C.3090109@earthlink.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Peter,

 >Right now I am doing this with PHP and a recursive function, but is it
 >possible to do this directly with one query?

SQL is not recursive, so you need an sproc. There are some examples with 
discussion at 
http://www.artfulsoftware.com/mysqlbook/sampler/mysqled1ch20.html.

PB

-----

Peter Lauri wrote:
> Hi,
>
> This is an example of an table that I store categories in. Each category
> have a id and also a parent. If the parent_id is 0 that category is a
> super-category.
>
> Assume that I would like to get a list of all categories and its parent
> category, grandparents category etc down to super-category. For example, if
> I take category id 13 as an example:
>
> 13 should be chosen; because that is the one I am working with
> 9 should be chosen; because it is the parent to 13
> 6 should be chosen; because it is the parent to 9
> 1 should be chosen; because it is the parent to 6
>
> And that is it, because 1 has parent 0, and is therefore a super-category.
>
> Right now I am doing this with PHP and a recursive function, but is it
> possible to do this directly with one query?
>
> +----+-----------------------+----------+-----------+
> | id | name                  | priority | parent_id |
> +----+-----------------------+----------+-----------+
> |  1 | DME                   |      999 |         0 |
> |  2 | Training Material     |      999 |         0 |
> |  3 | RND                   |      999 |         0 |
> |  4 | LEAP                  |      999 |         1 |
> |  5 | TDI                   |      999 |         1 |
> |  6 | Technical Support     |      999 |         1 |
> |  7 | Training Module       |      999 |         1 |
> |  8 | Detail by Component   |      999 |         6 |
> |  9 | Step/Process          |      999 |         6 |
> | 10 | Assessment            |      999 |         9 |
> | 11 | Design                |      999 |         9 |
> | 12 | Implement and Monitor |      999 |         9 |
> | 13 | Evaluation            |      999 |         9 |
> | 14 | Reflection            |      999 |         9 |
> | 15 | Transition            |      999 |         9 |
> | 16 | TDI                   |      999 |         2 |
> | 17 | LEAP                  |      999 |         2 |
> | 18 | Other                 |      999 |         2 |
> | 19 | Tools                 |      999 |         3 |
> | 20 | R&D Document          |      999 |         3 |
> +----+-----------------------+----------+-----------+
>
> Best regards,
> Peter Lauri
>
>
>   


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.392 / Virus Database: 268.6.0/341 - Release Date: 5/16/2006