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Define an entity and an attribute. explain the different types of attributes that occur in an ER diagram model with an example.
Entity is a βthingβ in the real world with an independent existence. It can also be an object with physical existence (i.e. person, car) or conceptual existence (i.e. company, job).
Attribute
An attribute is a particular property that describes entity (i.e. person name company name).
Different types of attributes are:
Composite Attribute
Composite attribute is an attribute that can be divided into meaningful components.
Multivalued Attribute
Multivalued attribute is an attribute that can have many values.
Derived Attribute
Derived attribute is an attribute whose value is computed from another attribute or combination of attributes.
Complex Attribute
Complex attribute is composite and multivalued attributes nested in an arbitrary manner.
Key Attribute
Key attribute is an attribute whose values are distinct for each individual entity in the collection.
Value Set (Domain)
Value set specifies the set of values that may be assigned to that attribute for each individual entry.
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