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.

Anarchy means Absence of government.

A Windmill.

As an infant, the ability to produce antibodies is limited.

Skimming is the removal of any material or particles that are floating on the surface. Hence, Removal of oil and grease from sewage - waste water is called as skimming.

The followers of Islam religion is called Muslims.

According to Muslims, God sent prophets to mankind to teach them how to live according to His law. Muhammad is believed by Muslims to be the last prophet sent by God (Allah). The Muslim holy book is called the Quran.