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fundamentos
 

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by MIGUEL ANGEL CASTRO BUSTOS
1

¿Las entidades se describen en una base de datos mediante un conjunto de atributos?

2

Estos modelos estuvieron ligados fuertemente a la implementación subyacente y complicaban la tarea del modelado de datos. Como resultado precedieron al modelo de datos relacional. se usan muy poco actualmente, excepto en el código de bases de datos antiguo que aún está en servicio en algunos lugares.

3

cuando hablamos de un conjunto de uno o más atributos que son tomados colectivamente y que permiten identificar de forma única una entidad en el conjunto de entidades nos referimos a

4

La clave primaria de un conjunto de entidades permite distinguir entre las diferentes entidades del conjunto

5

cuando hablamos de limitación hablamos de ciertas restricciones,en el modelo E-R pasa esto cuando no resulta posible expresar relaciones tras relaciones la mejor forma de modelar esta situación es por medio de

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