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Cardinalidad, SQL y Claves

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Preguntas rápidas sobre cardinalidad y SQL.

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Cardinalidad, SQL y Claves
 

Cardinalidad, SQL y ClavesOnline version

Preguntas rápidas sobre cardinalidad y SQL.

by DAMIAN ALVAREZ VELAZQUEZ
1

Una clave primaria identifica de forma única cada fila en una tabla.

2

En una relación 1:N, una fila de la tabla A puede estar relacionada con varias filas de la tabla B.

3

Una clave foránea establece una relación entre dos tablas y suele referenciar la clave primaria de la tabla relacionada.

4

Una base de datos relacional sólo puede contener una tabla.

5

En SQL, un índice siempre garantiza unicidad de las filas sin necesidad de una clave única.

6

La cardinalidad describe cuántas filas de una tabla A se pueden relacionar con filas de una tabla B.

7

SELECT es una sentencia SQL que se usa para consultar datos.

8

UNION siempre conserva todos los registros, sin eliminar duplicados.

9

Una clave primaria puede contener valores NULL.

10

La normalización siempre reduce el rendimiento de las consultas.

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