I am totally new to drupal modules and I''ve got reading PRO DRUPAL DEVELOPMENT (John K. VanDyk)
and I work with drupal 6.x

Customers can judge a canteen. So they have to create a canteen with caterer.
I've got 2 tables:

[id-canteen] INT
[canteen_name] VARCHAR(255)
[canteen_description] VARCHAR(255)

[id_caterer] INT
[caterer_company_name] VARCHAR(255)
[caterer_website] VARCHAR(255)
[canteen_id_canteen] INT

The relationship between these tables is (caterer) 1 : N (canteen).

How must i perform these tables in drupal with NID's and other ID's?

Thanks for your reply!