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Im modelling a database in MSSQL 2008.
I have 4 tables.
**User**
userID
userName
**NewsCategory**
newsCategoryID
newsCategoryName
**News**
newsID
newsText
newsCategoryID
**Subscription**
userID
categoryID
I understand that I should have foreign keys between the News and the Category tables. But what should I do with the supscriptions? Should I have a Foreign Key between User and Subscription tables though it’s not mandatory to subscribe for something?
Yes you should. Foreign key is used for be sure, that Subscription is created for existing user. Foreign key does not mean, that user should be subscribed on something.