Which relationship type best describes a scenario with many employees on multiple projects?

Which relationship type best describes a scenario with many employees on multiple projects?

• A. One-to-One
• B. Many-to-Many
• C. One-to-Many
• D. Many-to-One

Answer: (B)

Many-to-many relationships describe a scenario where multiple records on one side relate to multiple records on the other side. Here, an employee can work on several projects, and each project can have several employees. That mutual multiplicity is what defines a many-to-many relationship. In practice, you’d model this with a junction or linking table (an associative entity) that records each employee–project assignment, allowing any employee to be linked to any number of projects and any project to include multiple employees. One-to-many would mean either a project has only one employee or an employee can be on only one project, and many-to-one is the reverse; neither fits the scenario.

Many-to-many relationships describe a scenario where multiple records on one side relate to multiple records on the other side. Here, an employee can work on several projects, and each project can have several employees. That mutual multiplicity is what defines a many-to-many relationship. In practice, you’d model this with a junction or linking table (an associative entity) that records each employee–project assignment, allowing any employee to be linked to any number of projects and any project to include multiple employees. One-to-many would mean either a project has only one employee or an employee can be on only one project, and many-to-one is the reverse; neither fits the scenario.