Question

What the use of Primary key in a table?​

Answer 1

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

the primary scheme constraint Unity identify each record in a table primary key contains unique values and cannot contain null values a table can only have one primary key and is a table this primary key concept of single or multiple columns