Why and where are surrogate keys used in the data warehouse?

Question

They are used to relate the facts in the fact table to the appropriate rows in the dimension tables, with the business keys only occurring in the (much smaller) dimension tables to keep the link with the identifiers in the operational systems. 18 нояб. 2017 г.

What is a surrogate key and why use them?

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.

When would you use a surrogate key example?

Among the candidate keys, you choose one as the primary key of a table. For example, you can choose customer_id as the primary key of your table. If what you choose is not a nature key, but a system generated identifier, it is called surrogate key. Or we can say that you use a surrogate key” as the primary key.

Expert · Answer

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.

Expert · Answer

Among the candidate keys, you choose one as the primary key of a table. For example, you can choose customer_id as the primary key of your table. If what you choose is not a nature key, but a system generated identifier, it is called surrogate key. Or we can say that you use a surrogate key” as the primary key.

Why and where are surrogate keys used in the data warehouse?

What is a surrogate key and why use them?

When would you use a surrogate key example?

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