Why do we need a primary key short answer?

Why do we need the primary key?

Each database table needs a primary key because it ensures row-level accessibility. If you choose an appropriate primary key, you can specify a primary key value, which lets you query each table row individually and modify each row without altering other rows in the same table.

Why do we need a primary key class 7?

Explanation: 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.

Why do we need a primary key for Class 8?

Answer: Primary key is a field that uniquely identifies each record in a table. For example, in a school database, the Roll Number of each student uniquely identifies each student. A Primary key does not allow Null Values and must always have a unique value.

What is primary key short answer?

A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN). A relational database must always have one and only one primary key.