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Bases de datos. Características
Identificación de entidades:
¿Qué información queremos automatizar? la base de datos con toda la información relacionada con la Librería
¿Qué archivos se necesitan?
Entidades: Libros, clientes y proveedores
Representación de entidades: las entidades son: libros, clientes y proveedores
Definición de campos:
Por ejemplo, en la entidad Libros
Descripción física y de contenido: Autor, Título, A. Edición, ISBN
Descripción material y económica: Ejemplares de cada ISBN, precio de cada ISBN, stock de cada ISBN.
Definición de registros:
-
Longitud fija
-
Longitud variable
-
Longitud indefinida
Identificación de relaciones:
Clientes - Libros
Proveedores - Libros
Ventas: ventas - libros
Representación de relaciones: Ventas, pedidos y distribución.
Tipos de relaciones:
Definición de campos clave: Necesario para establecer relaciones entre entidades
Campos clave:
-
Libros: campo clave ISBN
-
Ventas: campo clave ISBN
Aportaciones de las B.D
-
Precisión
-
Exhaustividad
-
Rapidez
-
Gestión
-
Relación
-
Recuperación
Condiciones de un sistema de B.D
Descargar
Enviado por: | El remitente no desea revelar su nombre |
Idioma: | castellano |
País: | España |