Questions

TRUST.

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.

Thyroxin or Thyroxine is the thyroid hormone that regulates carbohydrate metabolism in the human body.

Economics is the study of how society manages its scarce resources i.e, Limited wants & unlimited resources.

Alter database backup control file to trace