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CLAVE PRIMARIAS Y FORÁNEAS

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PREGUNTAS SOBRE CLAVES PRIMARIAS Y FORANEAS

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Ecuador

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CLAVE PRIMARIAS Y FORÁNEAS
 

CLAVE PRIMARIAS Y FORÁNEASOnline version

PREGUNTAS SOBRE CLAVES PRIMARIAS Y FORANEAS

by María José Contento Segarra
1

La clave primaria puede contener valores nulos.

2

La clave primaria identifica de forma única cada registro de una tabla.

3

Una tabla puede tener más de una clave primaria.

4

Una clave foránea (FK) sirve para relacionar una tabla con otra mediante la clave primaria.

5

La clave foránea apunta a la clave primaria de otra tabla.

6

Las relaciones entre tablas ayudan a organizar mejor la información.

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