What are the differences between super key primary key candidate key and foreign key?

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1244411

2026-10-15 01:45

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  • Super key: A set of attributes that uniquely identifies a tuple in a table.

  • Primary key: A specific super key chosen to uniquely identify each tuple in a table and must be unique and not null.

  • Candidate key: Any super key that could be chosen as the primary key.

  • Foreign key: A field in a table that is a primary key in another table, used to establish a relationship between the two tables.

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