clustering tables question

When clustering two tables, for example:

Product_Groups (
id - primary key
group_name
)

Individual_Products (
product_group_id -foreign key to Product_Groups.id product_description
)

Do you cluster on Product_Groups.id, ie) the primary key OR do you cluster on Individual_Products.product_group_id, ie) foreign key?

An example query might be:

SELECT group_name, product_description
FROM Product_Groups, Individual_Products WHERE product_group_id = id;

Thanks in advance.

-----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own Received on Wed Dec 16 1998 - 10:26:11 CST