What is natural key in Oracle?

What is a natural key in database?

A natural key is a column or set of columns that already exist in the table (e.g. they are attributes of the entity within the data model) and uniquely identify a record in the table. Since these columns are attributes of the entity they obviously have business meaning.

What is the difference between primary key and natural key?

A primary key uniquely identifies each record within a table and relates records to additional data stored in other tables. A natural key might require several fields to accomplish a unique identity for each record.

What is natural key with example?

Natural key. A key that is formed of attributes that already exist in the real world. For example, U.S. citizens are issued a Social Security Number (SSN) that is unique to them (this isn't guaranteed to be true, but it's pretty darn close in practice).

What is surrogate key and natural key with example?

key is a unique value that identifies each record. Sometimes the primary key is. made up of real data and these are normally referred to as natural keys, while. other times the key is generated when a new record is inserted into a table. When a primary key is generated at runtime, it is called a surrogate key.