Question

2 What
د
is the
use of
primary key?​

Answer 1

Answer:

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Explanation:

The primary key is used for four primary tasks: First, it is used to uniquely identify the rows in a table or a relation. Second, it is used to represent rows in relationships. Third, most DBMS products use the values of the primary key to organize the storage of the relation.

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Answer 2

Answer:

A primary key is used to ensure data in the specific column is unique. You can only set constraints with primary keys, by setting a foreign key to another column which creates a relationship with the column that has the primary key set. A prime use of a primary key is in the case of a users table.

Explanation:

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