Describe what attributes represent in an ER model and provide examples of simple, composite, single-value, multi-value, and derived attributes.
What will be an ideal response?
An attribute represents a property of an entity or a relationship type (see Section 12.3).
Examples:
Simple: position or salary attribute of Staff
Composite: address attribute composed of street, city, and postcode attributes
Single-valued: branchNo attribute of Branch
Multi-valued: telNo attribute of Branch
Derived: duration attribute of Lease, calculated from rentStart and rentFinish
attributes.
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Fill in the blank(s) with the appropriate word(s).
The figure above shows the ____.
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