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i have the following 2 sql server tables
Products
locationCode (PK), prodId (PK), productName
---------------------------------
AUG, 1, Widget
ATL, 1, Widget
Categories
prodId (PK) catId (PK), catName
----------------------------------
1, 1, WidgetsCategory
1, 1, WidgetsCategory
What would I need to do to create an association where a single product can have many categories given the required fields and (PK) Primary keys?
Create one more table that relates products to categories.
This table should contain the key of products and a foreign key (category id).
In your original question you don’t mention whether the location code matters or not. You also don’t mention if this is a 1-N or M-N type relationship.
Provide a bit more detail to get additional help.
When you normalize your tables you ensure every table has fields related with only itself (unless of course you are creating that relationship and you store the keys to make that relationship).
Your categories table should only include categories, and should not have anything to do with a product. Once you establish a Category entity, you then relate that category to another product, via another table.