What are some examples of data dependency in databases?

What are some examples of data dependency in databases?

Data dependency in databases refers to the relationship between data elements. For example, in a customer database, the customer's address is dependent on the customer ID. If the customer ID changes, the address must also be updated accordingly.

Can you give me another example?

Sure! In a sales database, the total sales amount is dependent on the quantity sold and the price per item. If either the quantity or price changes, the total sales amount will also change.

How does data dependency affect database design?

Data dependency affects database design by influencing normalization. Properly managing dependencies helps reduce redundancy and improve data integrity.

What are the types of data dependencies?

The main types of data dependencies include functional dependency, transitive dependency, and multivalued dependency. Each type plays a role in database normalization.