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Evaluación sobre Relaciones

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Evaluación sobre Relaciones

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Relaciones y consultas en base de datos en Access.

Created by

Carito Mejia
Carito Mejia
Ecuador

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Evaluación sobre Relaciones
 

Evaluación sobre RelacionesOnline version

Relaciones y consultas en base de datos en Access.

by Carito Mejia
1

Herramienta encargada del modelado de datos que permite representar las entidades relevantes de un sistema de información así como sus interrelaciones y propiedades.

2

En este tipo de relación, un registro de la tabla 1 sólo puede estar enlazado con un único registro de la tabla 2 y viceversa. Este tipo de relación es la que menos se utiliza.

3

En el modelo relacional, elemento que se encarga de definir o identificar las características de las entidad (es el contenido de esta entidad). pueden ser de distintos tipos (numéricos, texto, fecha...). ¿Qué elemento del modelo E-R enfoca el enunciado?

4

Identifica inequívocamente un solo atributo no permitiendo que se repita en la misma entidad. Como sería la matrícula o el número de chasis de un coche (no puede existir dos veces el mismo).

5

En el modelo E-R, existe un elemento que representa cosas u objetos (ya sean reales o abstractos), que se diferencian claramente entre sí. ¿A qué elemento del modelo relacional nos referimos?

 
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