Q3 Explain the following terms and give examplesWeak EntityUnaryBinaryTernaryDomainEntity set or typeEntity

Weak Entity: A weak entity is a type of entity in a relational database that cannot be uniquely identified by its attributes alone. It must use a foreign key in conjunction with its attributes to create a primary key. For example, in a database of a library, the 'Borrow' entity might be a weak entity. It cannot be uniquely identified by its attributes alone (Borrow Date, Return Date), but by combining them with the foreign key (Book ID, Member ID), we can uniquely identify each 'Borrow'.

Unary: Unary refers to an operation, relationship, or function that involves only one component or entity. In the context of databases, a unary relationship is a relationship between instances of a single entity type. For example, in a database of a company, a 'Manager' entity might have a unary relationship with itself, indicating that one manager supervises another manager.

Binary: Binary refers to an operation, relationship, or function that involves two components or entities. In databases, a binary relationship involves two different entities. For example, in a university database, a 'Student' entity and a 'Course' entity might have a binary relationship, indicating that a student enrolls in a course.

Ternary: Ternary refers to an operation, relationship, or function that involves three components or entities. In databases, a ternary relationship involves three different entities. For example, in a sales database, a 'Customer', 'Product', and 'Store' might have a ternary relationship, indicating that a customer buys a product from a store.

Domain: In the context of databases, a domain refers to the set of possible values that a particular attribute can have. For example, in a 'Student' entity, the 'Gender' attribute might have a domain of {'Male', 'Female'}.

Entity set or type: An entity set or type is a collection of entities that share the same attributes. For example, in a university database, 'Student' might be an entity type, with each individual student being an entity of that type.

Entity: An entity is a thing or object in the real world that is distinguishable from all other objects. For example, in a university database, each individual student, course, or professor could be considered an entity.