We can see in diagram many users are associated with many books denoted by * and this represents a many-to-many type of relationship. For denoting one element we use 1, for zero elements we use 0, and for many elements we use *. These relations can be one-to-one, many-to-many, and many-to-one or one-to-many. Multiplicity means that number of elements of a class is associated with another class. All of these, share a relationship and these relationships are known as aggregate relationships. Further, for “Account” class, “User” is a superclass. These classes are User, Book, and Librarian as shown in diagram. ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.DevOps Engineering - Planning to Production.Python Backend Development with Django(Live).Android App Development with Kotlin(Live).Full Stack Development with React & Node JS(Live).Java Programming - Beginner to Advanced.Data Structure & Algorithm-Self Paced(C++/JAVA).Data Structure & Algorithm Classes (Live).
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