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Enhanced ER-diagram Prof. Sin-Min Lee go away workforcet of Computer Science  voice: A library database contains a inclination of indites that possess scripted books on heterogeneous(a) subjects (one author per book). It likewise contains boot intimately libraries that behave books on heterogeneous subjects. RELATIONSHIPS (Cont) Example: A library database contains a listing of authors that have written books on various subjects (one author per book). It also contains information about libraries that do books on various subjects. Entity frozens: authors, subjects, books, libraries RELATIONSHIPS (Cont) Example: A library database contains a listing of authors that have written books on various subjects (one author per book). It also contains information about libraries that carry books on various subjects.

Entity objurgates: authors, subjects, books, libraries Relationship rophys: wrote, carry, advocatored RELATIONSHIPS (Cont) undefendable subject area index subject title SS# authors gripe in carry show libraries wrote books isbn RELATIONSHIPS (Cont) Subject matter index subject title SS# authors forebode essence address carry libraries wrote books isbn  double star RELATIONSHIP B courtesy be: A binary relationship between entity tick A and 1:1 Women uniteing Men (function) A women men N:1 Children marry mothers (function) having B 1:N Mothers having 1children (inverseAfunction) having mothers children M:N Students enrolled in a class 1 n mothers having children A n B B students enrolled classes A B  Entities and relationships ar distinguishable using various tonalitys A key is a conclave of one or more attributes, e.g., social-security number, combination of name and social-security number. A superkey is a key defined either for an entity specialise or relationship set that uniquely identifies an entity, e.g., social-security number, phone number, combination of name and social-security number. A aspect key is a marginal superkey that...If you want to get a full essay, order it on our website: Orderessay

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