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APLICACIÓN DEL MODELO
E-R Y E-R EXTENDIDO
POR: ALEXIS GARDUÑO
VALLE
MODELO ENTIDAD -RELACIÓN
PASO 1
Identificamos las Entidades.
PASO 2
IDENTIFICAMOS LOS ATRIBUTOS DE LAS ENTIDADES.
PASO 3
IDENTIFICAMOS LAS RELACIONES ENTRE LAS ENTIDADES.
PASO 4
COLOCAMOS LA CARDINALIDAD DE LAS RELACIONES.
¿COMO SE COLOCA LA CARDINALIDAD?
¿Un Taxi cuantos propietarios tiene?
R/ uno (El uno se pone en PROPIETARIO)
¿Un Propietario cuantos Taxis tiene?
R/ Varios (La N se pone en TAXI)
¿Un taxi cuantos Conductores tiene?
R/ varios (La N se pone en
CONDUCTOR)
¿Un conductor Cuantos taxis maneja?
R/ Uno (El Uno se pone En TAXI
MODELO ENTIDAD RELACION
EXTENDIDO
PASO 1
REALIZAR EL MODELO ENTIDAD RELACION COMO YA SE VIO ANTERIORMENTE
PERO ESTE SERA EXTENDIDO
PASO 2
• INDENTIFICAR LA ESPECIALIZACION
PASO 2
IDENTIDICAR LA AGREGACION
*EL DEPARTAMENTO PERTENECE AL
EMPLEADO, EL EMPLEADO ES UN TECNICO
Y EL TECNICO TRABAJA EN UN PROYECTO
PASO 4
COMO SE HIZO ANTERIORMENTE, APLICAR LA
CARDINALIDAD

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Manejo de RE y RE extendido