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I have a database with the following tables, Member, Paper, Topic, Interest, Associated.
I need a member to register than upload a paper. When they register they state their interests and this should appear on their home screen.
However in my tables interest i have member_id and topic_id, do i need a primary key for this table? As both of those are foreign keys. And with associated i have paper_id and topic_id but again i have no clue as to what the primary keys should be in those tables.
In this case, it is a composite primary key
You can check an example here -> http://sqlzoo.net/howto/source/z.dir/tip241027/i02create.xml