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Alter database backup control file to trace

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.

Someone who receives money in exchange for a promise to pay it back later is called a borrower1, and the person making the loan is the lender.

RBI issued currency notes under Fixed Minimum Reserve System.

Gravitational Force