4.4

Strong Entity

An entity that can be identified by its own attributes and does not rely on another entity.

Weak Entity

An entity that cannot be identified by its own attributes and relies on a strong entity for identification.

Identifying Relationship

A relationship in which one entity identifies another, usually between a strong entity and a weak entity.

Identifying Attributes

Attributes of an entity that are used to uniquely identify instances of that entity.

Entity Instance

A specific occurrence of an entity in a database.

One-to-One Relationship

A relationship in which a single instance of one entity is associated with a single instance of another entity.

Database Designers

Professionals who design and create database structures and schemas.

Zero or Many Relationships

A type of relationship where an entity may identify no weak entities or multiple weak entities.