What is the implication of a strong entity in a database system?

A strong entity in a database system is characterized by its ability to exist independently of other entities. This means that it can have its own unique identifier, typically represented by a primary key, which allows it to be recognized distinctly without needing the context of other entities. Strong entities can stand alone, and they often represent real-world objects or concepts that have sufficient attributes to be identifiable on their own.

In contrast, weak entities depend on strong entities for their existence and identification, which illustrates the relationship between strong and weak entities in a relational database. Weak entities do not have enough unique attributes to form a primary key independently; hence, they are linked to strong entities through a relationship.

The other statements do not accurately describe the characteristics of strong entities: they can indeed have relationships with other entities, are identified by a primary key, and do not rely solely on weak entities for identification. Understanding these key features of strong entities is fundamental in database design, as it sets the foundation for how data relationships and structures are constructed within a relational model.