What is the use of business keys in fact tables?

What are business keys?

A Business key is the column or set of columns that uniquely identifies each row in an entity. Through definitions of business keys, you guarantee that the information held in the key column (or columns) of each record will differentiate it from all the other records in the same entity (avoid duplicates).

What is a business key in datawarehouse?

Each dimension table consist of its business key attribute, the one that uniquely identifies a row in the table. The business key is the attribute that is known in the operational system by the business users.

What keys are present in fact table?

Each of the dimensional tables includes a primary key (product, time_code, customer, district_code), and the corresponding columns in the fact table are foreign keys. The fact table also has a primary (composite) key that is a combination of these four foreign keys.

Why do we need a surrogate key in fact table?

Fact table surrogate keys, which are not associated with any dimension, are assigned sequentially during the ETL load process and are used 1) as the single column primary key of the fact table; 2) to serve as an immediate identifier of a fact table row without navigating multiple dimensions for ETL purposes; 3) to allow ...