Question

Explain the use of Primary key in a table​

Answer 1

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Answer:

The PRIMARY KEY constraint uniquely identifies each record in a table. Primary keys must contain UNIQUE values, and cannot contain NULL values. A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).

Explanation:

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Answer 2

Answer:

PRIMARY KEY IS USED AS A UNIQUE KEY IN A RELATIONAL DATABASE WHICH IS UNIQUE FOR EACH RECORD. A DATABASE MUST HAVE ONE PRIMARY KEY AND THE VALUE OF PRIMARY KEY MATCHES TO THE ATTRIBUTES OF FOREIGN KEY ..

ITS VALUE CAN,T BE NULL

HAVING CLUSTURED INDEX.

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