When should I use surrogate keys in databases?

When should I use surrogate keys in databases?

Surrogate keys are used when you need a unique identifier that is not derived from the data itself. They are especially useful in scenarios where natural keys are either too complex or subject to change.

Can you give me an example of a surrogate key?

Sure! A common example of a surrogate key is an auto-incrementing integer in a database table, like a user ID that doesn't have any business meaning.

What are the advantages of using surrogate keys?

Some advantages include simplicity, stability, and improved performance in joins and indexing, as they are typically smaller and fixed in size.

Are there any downsides to using surrogate keys?

Yes, potential downsides include losing the natural meaning of the data and the need for additional logic to maintain relationships between tables.

How do surrogate keys compare to natural keys?

Surrogate keys are artificial and do not carry business meaning, while natural keys are derived from the data itself and can provide context. The choice depends on the specific use case.