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Bases de datos: 10 preguntas fáciles

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Bases de datos: 10 preguntas fáciles

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Quiz básico de bases de datos

Created by

Navarro González Vanezza
Navarro González Vanezza
Mexico

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Bases de datos: 10 preguntas fáciles
 

Bases de datos: 10 preguntas fácilesOnline version

Quiz básico de bases de datos

by Navarro González Vanezza
1

¿Qué es una base de datos orientada a relaciones entre datos?

2

¿Qué indica la clave primaria en una tabla?

3

¿Qué es una clave foránea?

4

¿Cuál es el objetivo de normalizar una base de datos?

5

¿Qué es SQL?

6

¿Qué tipo de operación es una consulta SELECT?

7

¿Qué representa una relación 1:N entre tablas?

8

¿Qué opción describe un índice en una base de datos?

9

¿Qué es una transacción ACID?

10

¿Qué hace una sentencia UPDATE en SQL?

Explicación

Las BD relacionales usan tablas y relaciones entre ellas.

La clave primaria identifica de forma única cada registro.

Permite relacionar tablas distintas mediante referencias.

La normalización evita duplicidad y mejora integridad.

SQL se usa para SELECT, INSERT, UPDATE, DELETE.

SELECT recupera datos de una o varias tablas.

En 1:N, una fila de la tabla A puede vincularse a muchas de la tabla B.

Los índices mejoran velocidad de consultas, no modifican datos.

ACID garantiza la confiabilidad de operaciones de BD.

UPDATE cambia valores de fila existentes.

 
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