Question

A. What is the use of a primary key in a database?​

Answer 1

Answer:

In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). Informally, a primary key is "which attributes identify a record", and in simple cases are simply a single attribute: a unique id.

Answer 2

Question -

➛ What is the use of primary key in a keyboard?

Answer :-

➛ Primary key is a very important feature in making a database due to the following reasons :-

• It ensures a row-level accessibility.
• It contains a unique value of its own neither than a null value.
• It consists of single or multiple columns(fields).
• It allows to delete/update specific records by uniquely identifying them.
• It helps us to avoid in inserting duplicate records of a table.

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