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Bases de Datos Relacionales: Quiz Parcial 1

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Bases de Datos Relacionales: Quiz Parcial 1

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Quiz sobre SQL y normalización

Created by

ANAHI YESCAS HUERTA
ANAHI YESCAS HUERTA
Mexico

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Bases de Datos Relacionales: Quiz Parcial 1
 

Bases de Datos Relacionales: Quiz Parcial 1Online version

Quiz sobre SQL y normalización

by ANAHI YESCAS HUERTA
1

¿Qué hace la instrucción SELECT en SQL?

2

¿Qué cláusula se usa para filtrar filas según condiciones?

3

¿Cuál es la función de un JOIN?

4

¿Qué significa GROUP BY?

5

¿Qué hace ORDER BY?

6

¿Qué es una clave primaria?

7

¿Qué es una clave foránea?

8

¿Qué operación realiza INSERT?

9

¿Qué es la normalización?

10

¿Qué instrucción UPDATE ejecuta?

Explicación

SELECT recupera datos; no modifica estructuras ni inserta datos.

WHERE filtra filas; HAVING se usa con agregaciones, GROUP BY agrupa, ORDER BY ordena.

JOIN une tablas por relaciones, por ejemplo, claves foráneas.

GROUP BY agrupa para usar funciones de agregado.

ORDER BY organiza el conjunto de resultados al momento de devolverlos.

La PK debe ser única y no nula para cada fila.

FK mantiene la integridad referencial entre tablas.

INSERT agrega datos; no cambia estructura.

La normalización organiza datos en tablas relacionadas para evitar inconsistencia.

UPDATE cambia datos existentes, normalmente con WHERE para precisión.

 
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