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Completa comandos DDL y restricciones

Created by

Jonathan Lizano
Jonathan Lizano
Ecuador

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Fill in the blanks: DDL e integridad en PostgreSQLOnline version

Completa comandos DDL y restricciones

by Jonathan Lizano
1

Para diseñar una base de datos relacional robusta en PostgreSQL , el primer paso es definir la estructura física utilizando el lenguaje de definicif3n de datos .

A continuacif3n se presenta el script te9cnico para la creacif3n de tablas :

TABLE categorias (
id_categoria INT KEY ,
nombre VARCHAR ( 50 ) NULL
) ;

CREATE TABLE productos (
id_producto INT PRIMARY KEY ,
nombre VARCHAR ( 100 ) NOT NULL ,
precio NUMERIC NOT NULL ( precio > = 0 ) ,
id_categoria INT ,
KEY ( id_categoria ) REFERENCES categorias ( id_categoria )
) ;

 
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