Question

20.The primary key is a ______________________ key​

Answer 1

• A primary key is either an existing table column or a column that is specifically generated by the database according to a defined sequence .

✨ Primary Keywords .

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Answer 2

Answer:

Informally, a primary key is "which attributes identify a record", and in simple cases are simply a single attribute: a unique id. More formally, a primary key is a choice of candidate key (a minimal superkey); any other candidate key is an alternate key.

Explanation:

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