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CREATE ASSERTION IR1
CHECK (SELECT MIN(paga) FROM ACTUA_EN) ≥15000 ;
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CREATE ASSERTION IR2
CHECK (EXISTS(SELECT * FROM ACTOR AC, ACTUA_EN AE
WHERE AC.codA = AE.actor)) ;
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CREATE DOMAIN <nomDominio> [ AS ] <tipoDatos>
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CREATE DOMAIN Color AS VARCHAR(10)
DEFAULT ‘no-se’
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CHECK ( VALUE IN ( ‘marron’,‘gris’,‘azul’,‘verde’,‘negro’,‘no-se’ ) );
CREATE DOMAIN SEXO CHAR(1)
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CREATE TABLE <nombreTabla> ( <lista de elementos de tabla base> ) ;
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CREATE TABLE ACTOR
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( nombre
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FOREIGN KEY (<ListaAtributos>) REFERENCES <nomTabla> (<listaAtributos>)
[ ON DELETE { NO ACTION | CASCADE | SET DEFAULT | SET NULL } ]
[ ON UPDATE { NO ACTION | CASCADE | SET DEFAULT | SET NULL } ]
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CREATE TABLE ACTUA_EN
CREATE TABLE ACTUA_EN
( actor ... ,
( actor ... REFERENCES ACTOR(codA) ...,
film ... ,
film ... REFERENCES PELICULA(codP) ...,
papel ... ,
papel ... ,
PRIMARY KEY (actor, film),
PRIMARY KEY (actor, film)
FOREIGN KEY (actor)
... ) ;
REFERENCES ACTOR(codA) ...,
FOREIGN KEY (film) REFERENCES PELICULA(codP)
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CREATE TABLE ACTOR ( ...,
CONSTRAINT actor_cache_ok
CHECK ( cache > 50000 AND cache < 200000 ), ... );
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CREATE TABLE PELICULA ( ...,
CONSTRAINT pelicula_fechas_ok
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CREATE ASSERTION <nomRestricción>
CHECK ( <condición> ) ;
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CREATE ASSERTION age1_cache_ok
CHECK (NOT EXISTS (SELECT * FROM ACTOR
WHERE agencia=1 AND cache<50000)) ;
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CREATE ASSERTION num_actores_age_ok
CHECK (NOT EXISTS (SELECT * FROM AGENCIA
WHERE 40 < (SELECT SUM(*) FROM ACTOR
WHERE codAge=agencia ) ) ) ;
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CREATE ASSERTION paga_actores_ok
CHECK (NOT EXISTS (SELECT * FROM ACTUA_EN ACT, ACTUA_EN PROTA
WHERE ACT.film=PROTA.film AND ACT.actor<>PROTA.actor
AND PROTA.papel=‘protagonista’ AND ACT.paga>PROTA.paga ));
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CREATE ASSERTION existencia_distribuidora
CHECK ( 0 < SELECT COUNT (*) FROM DISTRIBUIDORA ) ;
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CREATE ASSERTION guion_codigo_unico
NOT EXISTS (SELECT * FROM GUION G1, GUION G2
WHERE G1.codG = G2. codG
AND NOT (G1.titulo=G2.titulo AND G1.descrip= G2.descrip));
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CREATE ASERTION actor_actuaen_pelicula
CHECK (NOT EXISTS (SELECT *
FROM ACTUA_EN AE, ACTOR A, PELICULA P
WHERE NOT (AE.actor = A.codA AND AE.film = P.codP) ) ;
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FOREIGN KEY (actor) REFERENCES ACTOR(codA)...
FOREIGN KEY (film) REFERENCES PELICULA(codP)...
\
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DROP ASSERTION <nomRestricción> ;
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DEFINE TRIGGER <nombre> ON <lista tablas> :
<condición> ACTION_PROCEDURE <llamada procedimiento>
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DEFINE TRIGGER Disp_Paga ON ACTUA_EN ACT, ACTUA_EN PROTA:
ACT.actor<>PROTA.actor AND ACT.film=PROTA.film
AND PROTA.papel=“protagonista” AND ACT.paga > PROTA.paga
ACTION_PROCEDURE SolicitarAprobacion(...) ;
‡ 'LIHUHQFLDHQWUHASSERTION y TRIGGER
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CREATE TABLE T1
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FOREIGN KEY (atrib1)
REFERENCES T2 (...) ... ,
... ) ;
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CREATE TABLE T2
( atrib2 ... ,
FOREIGN KEY (atrib2)
REFERENCES T1 (...) ... ,
... ) ;
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[ INITIALLY { DEFERRED | IMMEDIATE } ]
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‡ 6HQWHQFLD SET CONSTRAINTS
SET CONSTRAINTS { <listaRestricciones> | ALL } { DEFERRED | IMMEDIATE }
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