Question

explain 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

Answer 2

Answer:

primary key is the column having unique values and will be not null

example: admission no. of student , unique id

Explanation:

It is used to get information from the table