Question

What do you mean by primary key? What is the use of primary key. Also explain 4 different data types with the help of examples.​

Answer 1

Answer:

Lets take an example to understand the concept of primary key. In the following table, there are three attributes: Stu_ID, Stu_Name & Stu_Age. Out of these three attributes, one attribute or a set of more than one attributes can be a primary key