SQL Server :: Adjacency List Model?

Sep 25, 2010

Classic scenario - Categories, Subcategories and Products tables.

Subcategories belong to a corresponding main category

Products belong to a corresponding subcategory

The problem is that not all products do that. Some of them belong directly to a main category because that category has no subcategories. So if I wish to query those products I have to use a main category field in the products table.

And of course I need a subcategory field in the products table also for those products that do belong to a subcategory.

All that does not seem like a good normalized schema.

Now if I use the Adjacency list model the categories and subcategories tables become one (parentID column) and I only have to use a single CatId in my queries.

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