What is difference between surrogate key and natural key?

What is difference between surrogate key and business key?

Every row would have both a business key and a surrogate key. The surrogate key identifies one unique row in the database, the business key identifies one unique entity of the modeled world. One table row represents a slice of time holding all the entity's attributes for a defined timespan.

What is the use of surrogate key?

A surrogate key is a unique key for an entity in the client's business or for an object in the database. Sometimes natural keys cannot be used to create a unique primary key of the table. This is when the data modeler or architect decides to use surrogate or helping keys for a table in the LDM.

What is the difference between primary and surrogate keys in the database?

A surrogate key is a made up value with the sole purpose of uniquely identifying a row. Usually, this is represented by an auto incrementing ID. A primary key is the identifying column or set of columns of a table. Can be surrogate key or any other unique combination of columns (for example a compound key).

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.