Question

Write any four examples of Primary Key.​

Answer 1

Key. A key is one or more data attributes that uniquely identify an entity.

Composite key. A key that is composed of two or more attributes.

Natural key. A key that is formed of attributes that already exist in the real world.

Primary Key. A primary key is a column of a table or a set of columns that helps to identify every record present in that table uniquely.

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Answer 2

Answer:

primary key will be only one for each table and it doesn't allow null values and each primary key has its own unique key value