How to find all IDs of children recursively?

Question

I would like to get all IDs from children in a tree with MySQL only.

I have a table like this:

ID parent_id name
1  0         cat1
2  1         subca         


        

Answer 1

Seeing that the answer is basically no or at least not very easy with a single MYSQL statement, I'll post my php/mysql code to do the hierarchy list..

function createCategorySubArray()
{
    $categories = getSQL("SELECT pos_category_id FROM pos_categories");
    for($i=0;$i

Then you call it by $cat_array = createCategorySubArray();

I need this to find out which promotions based on product categories are being applied to the sub categories.