Consider a simplified relational schema for a Game Room (consisting of three relations):

- Shelf (shelfId, shelfName)

- Game (gameId, gameName, shelfId)

- Staff (staffId, staffName, shelfId)

The following conditions are satisfied:

- Every shelf has exactly one unique id and one unique name.

- Every board game has a unique id and one name, but different games may have the same name.

- Every staff has an id and a name, and no staffs in the store have the same id or name.

- A shelf can store many games, but each game is only placed on one shelf.

- A staff is responsible to one shelf, and one shelf is maintained by one or more staffs.

Question:

1.)What are the super keys for each of the relations: Shelf, Game, and Staff?

2.)What are the candidate keys for each of the relations: Shelf, Game, and Staff?

3.)What is the primary key for each of the relations: Shelf, Game, and Staff?

4.) What are the foreign keys for the relations: Shelf, Game, and Staff?

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