Questions

A primary key is a special relational database table column or combination of columns designated to uniquely identify all table records. That is, A primary key is a column or set of columns in a table that uniquely identifies tuples (rows) in that table.

A primary key, also called a Primary Keyword.

Main Features Primary key are ::

It must contain a unique value for each row of data.

It cannot contain null values.

Ultrabooks have the fastest optical drives is the only false statement regarding ultrabooks.

According to 2018 January reports, Mukesh Ambani is the first richest person in India being 18th in the world, followed by Azim Premji and S.P. Hinduja in second and third places.

The first wholly artificial gene was synthesized by Har Gobind Khorana.

Akshay Venkatesh, a renowned Indian-Australian mathematician, is one of four winners of mathematics’ prestigious Fields medal, known as the Nobel prize for math. New Delhi-born Venkatesh, 36, who is currently teaching at Stanford University, has won the Fields Medal for his profound contributions to an exceptionally broad range of subjects in mathematics.