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Database design for monthly leaderboards

I have a system where users can make predictions on events. There are about two events a week. When the event ends the system scores all the predictions and updates this in the database. Here is an ...
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Referencing multiple user id's in a single field

I'm creating a system where a user can make a prediction about an event, and if they get all the predictions correct they win. I have three tables: users, games and predictions. The structure of each:...