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ER, diccionario y cardinalidades

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ER, diccionario y cardinalidades

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Conceptos clave de ER y diccionario

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smylle leonardo alvarado zamora
smylle leonardo alvarado zamora
Colombia

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ER, diccionario y cardinalidades
 

ER, diccionario y cardinalidadesOnline version

Conceptos clave de ER y diccionario

by smylle leonardo alvarado zamora
1

Las relaciones pueden ser de grado 2 o más, es decir, pueden conectar a tres o más entidades.

2

El modelo entidad-relación describe entidades, atributos y relaciones entre ellas.

3

En cardinalidad 0..1, se garantiza que siempre habrá una coincidencia obligatoria.

4

El diccionario de datos describe solo el nombre de las tablas, sin atributos ni restricciones.

5

Una relación en ER siempre tiene participación total de todas las entidades involucradas; nunca parcial.

6

Un diccionario de datos documenta estructuras de datos, tipos de datos y restricciones de dominio.

7

La cardinalidad 1:N significa que una instancia de A puede relacionarse con muchas de B, pero cada B se relaciona con a lo sumo una A.

8

En un diagrama ER, la cardinalidad no se usa para definir participaciones.

9

En un diagrama ER, la cardinalidad indica cuántas instancias de una entidad pueden relacionarse con otra.

10

En un modelo ER, las entidades no deben tener atributos; solo las relaciones importan.

 
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