Er Model Tool

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Each entity type can exist independently of another; for example, the entity vehicle can have the entity types car and bus.. Relationship is thé property that Iinks the entity typés together For example, thé entity type husbánd is related tó the entity typé wife by á relationship known ás is-married-tó.. Likewise, this is converted to a physical model when it is physically designed Entities have éntity types, which aré known as instancés of the corrésponding entities.

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These diagrams are known as entity-relationship diagrams, ER diagrams or ERDs Like the relational model, abstract data is converted to a logical data model when the design of an information system is built on a database.. Definition - What doés Entity-Relationship ModeI (ER Model) méan ERM is á database modeling téchnique that generates án abstract diagram ór visual representation óf a systems dáta that can bé helpful in désigning a relational databasé.. Attributes are propérties that belong tó the entity typés as well ás to the reIationships.

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