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Quiz de Bases de Datos (Bachillerato)

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Quiz de Bases de Datos (Bachillerato)

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Test sobre bases de datos

Created by

HILARY GILDARDO GARDUÑO
HILARY GILDARDO GARDUÑO
Mexico

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Quiz de Bases de Datos (Bachillerato)
 

Quiz de Bases de Datos (Bachillerato)Online version

Test sobre bases de datos

by HILARY GILDARDO GARDUÑO
1

¿Qué describe un modelo relacional en bases de datos?

2

¿Qué se entiende por cardinalidad entre dos tablas?

3

¿Qué afirmación describe mejor la recolección de información para un BD?

4

¿Qué es una clave primaria?

5

¿Qué es una clave foránea?

6

¿Qué significa eliminar la redundancia en un modelo relacional?

7

¿Qué es una relación 1:N?

8

¿Qué instrucción se usa para consultar datos en SQL?

9

¿Qué es normalización?

10

¿Qué indica una relación 1:1?

Explicación

El modelo relacional organiza datos en tablas con relaciones, no es solo una base en la nube.

La cardinalidad indica cuántas filas de una tabla se relacionan con filas de otra.

Antes de implementar, se identifican entidades, atributos y relaciones.

La PK identifica de forma única cada registro de una tabla.

LaFK crea relaciones entre tablas distintas.

La normalización reduce duplicidad para evitar inconsistencias.

En 1:N, una fila de A puede asociarse a múltiples filas de B.

SELECT extrae datos de una o más tablas.

La normalización estructura datos en formas normales.

En 1:1, cada registro de una tabla se asocia exactamente a uno de la otra.

 
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