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.

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

Aruna Budda Reddy has created history by becoming the first Indian to win an individual medal at the Gymnastics World Cup in Melbourne, Australia. She clinched a Bronze medal in the Women’s Vault.

The Mesoamerican leader Pakal, The great was the king of a Maya city-state in the history.

Electrical discharge machining (EDM), also known as spark machining, spark eroding, burning, die sinking, wire burning or wire erosion, is a manufacturing process whereby a desired shape is obtained by using electrical discharges.