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Examen de Bases de Datos Relacionales

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Examen de Bases de Datos Relacionales

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Cuestionario de conceptos clave

Created by

Guillermo Thiwissen
Guillermo Thiwissen
Argentina

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Examen de Bases de Datos Relacionales
 

Examen de Bases de Datos RelacionalesOnline version

Cuestionario de conceptos clave

by Guillermo Thiwissen
1

¿Qué garantiza la Primera Regla de Integridad en una BD relacional?

2

¿Qué es una vista en una base de datos?

3

¿Qué es un SGBD?

4

¿Qué lenguaje permite manipular datos en un SGBD?

5

¿Qué cubre la Arquitectura de un sistema de BD en sus tres niveles?

6

¿Qué es la Independencia de Datos?

7

¿Qué consiste una relación en el modelo ER?

8

¿Qué tipo de relación conecta dos entidades en su forma más típica?

9

¿Qué describe la Cardinalidad en ER?

10

¿Qué es un identificador o clave en una entidad?

Explicación

La regla busca identificar cada registro de forma única usando su clave primaria.

Las vistas no almacenan datos por sí mismas; muestran datos de tablas existentes.

El SGBD coordina usuarios, datos y programas y se comunica con el OS.

DML inserta, actualiza, elimina y consulta datos.

Niveles: externo (a usuarios), conceptual (comunidad), interno (almacenamiento).

Permite evolucionar el diseño sin modificar las aplicaciones que usan la BD.

Relaciones enlazan entidades mediante vínculos y nombres (p. ej., trabajar).

La más común es entre dos entidades: binaria.

Indica cuántas instancias de una entidad pueden participar en la relación.

Clave primaria o candidata garantiza unicidad de cada registro.

 
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