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Thanks to eggyal for putting me on the right track. Seeing the relative complexity I do not feel so ashamed anymore that I could not crack it in the first go. I ended up doing some research and found some nice setups to used closure tables in mysql. I ended up creating a stored procedure to populate my closure table and of course the new table cust_closure. I renamed by links table to cust_links. cust_links: <pre><code>+-------------+---------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+---------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | customer_id | int(11) | YES | | NULL | | | linked_id | int(11) | YES | | NULL | | +-------------+---------+------+-----+---------+----------------+ </code></pre> cust_closure: <pre><code>+-------------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+---------+------+-----+---------+-------+ | customer_id | int(11) | YES | | NULL | | | linked_id | int(11) | YES | | NULL | | | distance | int(11) | YES | | NULL | | +-------------+---------+------+-----+---------+-------+ </code></pre> And then added the stored procedure: <pre><code>CREATE PROCEDURE populate_cust_closure() BEGIN DECLARE distance int; TRUNCATE TABLE cust_closure; SET distance = 0; -- seed closure with self-pairs (distance 0) INSERT INTO cust_closure (customer_id, linked_id, distance) SELECT customer_id, customer_id, distance FROM cust_links GROUP BY customer_id; -- for each pair (root, leaf) in the closure, -- add (root, leaf->child) from the base table REPEAT SET distance = distance + 1; INSERT INTO cust_closure (customer_id, linked_id, distance) SELECT cust_closure.customer_id, cust_links.linked_id, distance FROM cust_closure, cust_links WHERE cust_closure.linked_id = cust_links.customer_id AND cust_closure.distance = distance - 1; UNTIL ROW_COUNT()=0 END REPEAT; END // </code></pre> When I then called the stored procedure it produced: <pre><code>mysql> select * from cust_closure; +-------------+-----------+----------+ | customer_id | linked_id | distance | +-------------+-----------+----------+ | 1 | 1 | 0 | | 3 | 3 | 0 | | 7 | 7 | 0 | | 13 | 13 | 0 | | 1 | 5 | 0 | | 1 | 2 | 0 | | 1 | 11 | 0 | | 1 | 13 | 0 | | 13 | 14 | 0 | | 1 | 14 | 1 | | 3 | 4 | 0 | | 7 | 8 | 0 | +-------------+-----------+----------+ </code></pre> So now my original query becomes: <pre><code>SELECT username, firstname, lastname, email, active, level FROM customers WHERE id IN (SELECT linked_id FROM cust_closure WHERE customer_id=1); </code></pre> Thanks again for eggyal and hope this helps someone in the future.
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