Attributes

• Single vs. Multivalued
  • Single: Social insurance number, student number, ...
  • Multi: telephone numbers, Lecturers of a course,...
    
• Simple vs. Composite
  • Composite: Address = Apt#, Street, City, Postal code
    
    
    
  
  
• Null attribute - nocorresponding values
• Stored vs. Derived attribute
  • Stored: Individual mark of a student
  • Derived: Overall grade in a class

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