Database System Concepts by Abraham Silberschatz, Henry Korth, S. Sudarshan

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By Abraham Silberschatz, Henry Korth, S. Sudarshan

This ebook is a demand for a path that i'm taking. The booklet is riddled with error. you could randomly open any web page from the e-book- and you'll find typos and complicated textual content. On a few pages, the powerpoint slides for the ebook don't even fit with the textual content of the e-book. this can be the 6th version of this textbook. I think of it inexcusable that the ebook has countless numbers of typos even after being released for greater than ten years. As one other reviewer mentioned, the extra fabric that's wanted for the e-book -like SQL schemas- don't even exist within the book's web site- opposite to what the booklet claims. anyone who's contemplating this ebook may still consider carefully. Please get it from the library - battle through the booklet for every week to work out what I suggest- and unload the e-book for any e-book that are supposed to be higher than this.

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CAPÍTULO 1 El modelo orientado a objetos se puede observar como una extensión del modelo E-R con las nociones de encapsulación, métodos (funciones) e identidad de objeto. El Capítulo 8 examina el modelo de datos orientado a objetos. El modelo de datos relacional orientado a objetos combina las características del modelo de datos orientado a objetos y el modelo de datos relacional. El Capítulo 9 lo examina. Los modelos de datos semiestructurados permiten la especificación de datos donde los elementos de datos individuales del mismo tipo pueden tener diferentes conjuntos de atributos.

1. Lenguaje de definición de datos La manipulación de datos es: Un esquema de base de datos se especifica mediante un conjunto de definiciones expresadas mediante un lenguaje especial llamado lenguaje de definición de datos (LDD). Por ejemplo, la siguiente instrucción en el lenguaje SQL define la tabla cuenta: • La recuperación de información almacenada en la base de datos. • La inserción de información nueva en la base de datos. • El borrado de información de la base de datos. • La modificación de información almacenada en la base de datos.

Como otro ejemplo, considérese un usuario que desee encontrar su saldo de cuenta en World Wide Web. Tal usuario podría acceder a un formulario en el que introduce su número de cuenta. Un programa de aplicación en el servidor Web recupera entonces el saldo de la cuenta, usando el número de cuenta proporcionado, y pasa la información al usuario. La interfaz de usuario normal para los usuarios normales es una interfaz de formularios, donde el usuario puede rellenar los campos apropiados del formulario.

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