A relationship line normally connects parent and child tables. What Are the Critical Relationship Types Found in a Data Model? Describe Them. Instead of having primary or composite primary keys, data modelers create the surrogate key, which is a valuable tool for identifying records, building SQL queries, and enhancing performance.
This surrogate key replaces natural keys.
What’s the Definition of a Surrogate Key?Ī surrogate key, also known as a primary key, enforces numerical attributes. Entities reside in boxes, and arrows symbolize relationships. What Does ERD Stand for, and What is it?ĮRD stands for Entity Relationship Diagram and is a logical entity representation, defining the relationships between the entities. The procedure enhances read performance by sacrificing write performance. So, What is Denormalization, and What is its Purpose?ĭenormalization is a technique where redundant data is added to an already normalized database.