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1. They are querying for the user based on the id sent in. They are mapping the result to a map, it appears. Check out Spring as it looks like that is what they are using.
2. Download toad and log into the database and check the constraints. I think toad also may make a relationship diagram, I know dbvisualizer will, both are free.
Can't answer the other two.
Good luck on your new job.
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