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Bases de datos: fundamentos

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Bases de datos: fundamentos

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Cuestionario de bases de datos

Created by

Gabriel pasi
Gabriel pasi
Argentina

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Bases de datos: fundamentos
 

Bases de datos: fundamentosOnline version

Cuestionario de bases de datos

by Gabriel pasi
1

¿Qué es una FK en una relación entre tablas?

2

En una consulta SQL, ¿qué hace SELECT * FROM empleados?

3

¿Qué indica FROM en una sentencia SELECT?

4

¿Qué tipo de dato sería adecuado para almacenar edad en una base de datos?

5

¿Qué instrucción se usa para agregar una fila nueva en una tabla?

6

En DB Browser, ¿cómo se representan entidades y relaciones?

7

¿Qué significa PK en una tabla de base de datos?

8

¿Qué tipo de relación puede existir entre estudiantes y cursos si un estudiante puede inscribirse a muchos cursos y un curso tiene muchos estudiantes?

9

¿Qué describe un algoritmo de normalización?

10

¿Qué es una base de datos?

Explicación

La FK enlaza registros entre tablas. Mantiene la integridad referencial.

SELECT * FROM tabla devuelve todas las columnas de todas las filas.

FROM señala la fuente de datos, la(s) tabla(s) involucradas.

Edad suele almacenarse como entero (INT); evitar valores no numéricos.

INSERT INTO agrega datos; otros comandos modifican o consultan.

Las entidades son tablas; las relaciones se modelan con FK entre tablas.

La PK identifica de forma única cada fila. No admite duplicados ni valores nulos.

Relación muchos a muchos requiere una tabla intermedia para enlaces.

La normalización reduce redundancias y mejora integridad.

 
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