Normalización de Bases de Datos y Técnicas de diseño

Antes de definir el cuarto nivel de F/N, veremos tres tipos de relaciones entre los datos: uno-a-uno, uno-con-varios y varios-con-varios. Mira la tabla usuarios en el Primer Nivel de F/N del ejemplo de arriba. Por un momento imaginámos que ponemos el campo url en una tabla separada, y cada vez que introducimos

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