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modelo relacional

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modelo relacional

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rellana los huecos con la respuesta correcta

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Mexico

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modelo relacional
 

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modelo relacionalOnline version

rellana los huecos con la respuesta correcta

by Arath Garcia Resendiz
1

El modelo relacional fue propuesto por . en el año 1970 .

2

En una base de datos relacional , las tablas también se conocen como .

3

Las filas de una tabla relacional se llaman y representan registros individuales .

4

Las filas de una tabla relacional se llaman y representan registros individuales .

5

Las columnas de una tabla se conocen como y definen los tipos de datos almacenados .

6

Una es un identificador único que distingue cada tupla en una relación .

7

El lenguaje más común utilizado para consultar bases de datos relacionales es ( ) .

8

La de entidad asegura que ninguna clave primaria tenga valores nulos o duplicados .

9

La garantiza que un valor de clave foránea coincida con un valor existente en otra tabla .

10

La indica que todos los datos deben estar representados explícitamente en tablas .

11

el modelo relacional se basa en dos fundamentos matemáticos : la teoría de y la lógica de .

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