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Entity-Relationship Model - Stanford University

1 Entity-Relationship ModelE/R DiagramsWeak entity SetsConverting E/R Diagrams to Relations2 Purpose of E/R Model The E/R Model allows us to sketch database schema designs. Includes some constraints, but not operations. Designs are pictures called Entity-Relationship diagrams. Later: convert E/R designs to relational DB for E/R Design is a serious business. The boss knows they want a database, but they don t know what they want in it. Sketching the key components is an efficient way to develop a working Sets entity = thing or object. entity set= collection of similar entities. Similar to a class in object-oriented languages. Attribute= property of (the entities of) an entity set. Attributes are simple values, integers or character strings, not structs, sets, Diagrams In an Entity-Relationship diagram: entity set = rectangle. Attribute = oval, with a line to the rectangle representing its entity : entity set Beershas two attributes, nameand manf(manufacturer).

Weak Entity Sets Occasionally, entities of an entity set need “help” to identify them uniquely. Entity set Eis said to be weak if in order to identify entities of Euniquely, we need to follow one or more many-one relationships from Eand include the …

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