Seja o modelo E-R em que todas as colunas foram definidas como INTEGER, pois os tipos de dados são irrelevantes para o problema. Qual modelo lógico relacional preserva a semântica do modelo acima? A) CREATE TABLE XY ( Y1 INTEGER NOT NULL, Y2 INTEGER NOT NULL, Y3 INTEGER, X1 INTEGER NOT NULL, X2 INTEGER, X3 INTEGER, R1 INTEGER, S1 INTEGER, ?1 INTEGER NOT NULL, CONSTRAINT XY _P K PRIMARY KEY (Y1,Y2), CONSTRAINT XY_UK1 UNIQUE (X1), CONSTRAINT XY_FK1 FOREIGN KEY (?1) REFERENCES ? (?1)) CREATE TABLE ? ( ?1 INTEGER NOT NULL, ?2 INTEGER, CONSTRAINT ?_PK PRIMARY KEY (?1)) B) CREATE TABLE X ( X1 INTEGER NOT NULL, X2 INTEGER, X3 INTEGER, CONSTRAINT X_PK PRIMARY KEY (x1)) CREATE TABLE Y ( Y1 INTEGER NOT NULL, Y2 INTEGER NOT NULL, Y3 INTEGER, X1 INTEGER NOT NULL, R1 INTEGER, CONSTRAINT Y_PK PRIMARY KEY (Y1,Y2), CONSTRAINT Y_UK1 UNIQUE (X1), CONSTRAINT Y_FK1 FOREIGN KEY (X1) REFERENCES X (X1)) CREATE TABLE ? ( ?1 INTEGER NOT NULL, ?2 INTEGER, CONSTRAINT ?_PK PRIMARY KEY (?1)) CREATE TABLE S ( X1 INTEGER NOT NULL, ?1 INTEGER NOT NULL, S1 INTEGER, CONSTRAINT S_PK PRIMARY KEY (X1,?1), CONSTRAINT S_FK1 FOREIGN KEY (X1) REFERENCES X (X1), CONSTRAINT S_FK2 FOREIGN KEY (?1) REFERENCES ? (?1)) C) CREATE TABLE X ( X1 INTEGER NOT NULL, X2 INTEGER, X3 INTEGER, ?1 INTEGER, S1 INTEGER, CONSTRAINT X_PK PRIMARY KEY (x1), CONSTRAINT X_FK FOREIGN KEY (?1) REFERENCES ? (?1)) CREATE TABLE Y ( Y1 INTEGER NOT NULL, Y2 INTEGER NOT NULL, Y3 INTEGER, X1 INTEGER NOT NULL, R1 INTEGER, CONSTRAINT Y_PK PRIMARY KEY (Y1,Y2), CONSTRAINT Y_UK1 UNIQUE (X1), CONSTRAINT Y_FK1 FOREIGN KEY (X1) REFERENCES X (X1)) CREATE TABLE ? ( ?1 INTEGER NOT NULL, ?2 INTEGER, CONSTRAINT ?_PK PRIMARY KEY (?1)) D) CREATE TABLE XY ( Y1 INTEGER NOT NULL, Y2 INTEGER NOT NULL, Y3 INTEGER, X1 INTEGER NOT NULL, X2 INTEGER, X3 INTEGER, R1 INTEGER, S 1 INTEGER, ?1 INTEGER NOT NULL, CONSTRAINT XY_PK PRIMARY KEY (Y1,Y2,X1), CONSTRAINT XY_FK1 FOREIGN KEY (?1) REFERENCES ? (?1)) CREATE TABLE ? ( ?1 INTEGER NOT NULL, ?2 INTEGER, CONSTRAINT ?_PK PRIMARY KEY (?1)) E) CREATE TABLE X ( X1 INTEGER NOT NULL, X2 INTEGER, X3 INTEGER, CONSTRAINT X_PK PRIMARY KEY (x1)) CREATE TABLE Y ( Y1 INTEGER NOT NULL, Y2 INTEGER NOT NULL, Y3 INTEGER, X1 INTEGER, R1 INTEGER, CONSTRAINT Y_PK PRIMARY KEY (Y1,Y2), CONSTRAINT Y_UK1 UNIQUE (X1), CONSTRAINT Y_FK1 FOREIGN KEY (X1) REFERENCES X (X1)) CREATE TABLE ? ( ?1 INTEGER NOT NULL, ?2 INTEGER, CONSTRAINT ?_PK PRIMARY KEY (?1)) CREATE TABLE S ( X1 INTEGER NOT NULL, ?1 INTEGER NOT NULL, S1 INTEGER, CONSTRAINT S_PK PRIMARY KEY (X1), CONSTRAINT S_FK1 FOREIGN KEY (X1) REFERENCES X (X1), CONSTRAINT S_FK2 FOREIGN KEY (?1) REFERENCES ? (?1))

A) CREATE TABLE XY ( Y1 INTEGER NOT NULL, Y2 INTEGER NOT NULL, Y3 INTEGER, X1 INTEGER NOT NULL, X2 INTEGER, X3 INTEGER, R1 INTEGER, S1 INTEGER, ?1 INTEGER NOT NULL, CONSTRAINT XY _P K PRIMARY KEY (Y1,Y2), CONSTRAINT XY_UK1 UNIQUE (X1), CONSTRAINT XY_FK1 FOREIGN KEY (?1) REFERENCES ? (?1)) CREATE TABLE ? ( ?1 INTEGER NOT NULL, ?2 INTEGER, CONSTRAINT ?_PK PRIMARY KEY (?1))

Seja o modelo E-R em que todas as colunas foram definidas como INTEGER, pois...

1Q121658 | Informática , SQL, Analista de Sistemas Júnior Engenharia de Software, Petrobras, CESGRANRIO

Seja o modelo E-R em que todas as colunas foram definidas como INTEGER, pois os tipos de dados são irrelevantes para o problema.
Qual modelo lógico relacional preserva a semântica do modelo acima?

✂️ a) CREATE TABLE XY (
     Y1    INTEGER NOT NULL,
     Y2    INTEGER NOT NULL,
     Y3    INTEGER,
     X1    INTEGER NOT NULL,
     X2    INTEGER,
     X3    INTEGER,
     R1    INTEGER,
     S1    INTEGER,
     ?1    INTEGER NOT NULL,
     CONSTRAINT XY_PK   PRIMARY KEY (Y1,Y2),
     CONSTRAINT XY_UK1 UNIQUE (X1),
     CONSTRAINT XY_FK1 FOREIGN KEY (?1) REFERENCES ? (?1))
     CREATE TABLE ? (
     ?1    INTEGER NOT NULL,
     ?2    INTEGER,
     CONSTRAINT ?_PK PRIMARY KEY (?1))
✂️ b) CREATE TABLE X (
     X1    INTEGER NOT NULL,
     X2    INTEGER,
     X3    INTEGER,
     CONSTRAINT X_PK PRIMARY KEY (x1))
     CREATE TABLE Y (
     Y1    INTEGER NOT NULL,
     Y2    INTEGER NOT NULL,
     Y3    INTEGER,
     X1    INTEGER NOT NULL,
     R1    INTEGER,
     CONSTRAINT Y_PK     PRIMARY KEY (Y1,Y2),
     CONSTRAINT Y_UK1   UNIQUE (X1),
     CONSTRAINT Y_FK1   FOREIGN KEY (X1) REFERENCES X (X1))
     CREATE TABLE ? (
     ?1 INTEGER NOT NULL,
     ?2 INTEGER,
     CONSTRAINT ?_PK PRIMARY KEY (?1))
     CREATE TABLE S (
     X1    INTEGER NOT NULL,
     ?1    INTEGER NOT NULL,
     S1    INTEGER,
     CONSTRAINT S_PK PRIMARY   KEY (X1,?1),
     CONSTRAINT S_FK1 FOREIGN KEY (X1) REFERENCES X (X1),
     CONSTRAINT S_FK2 FOREIGN KEY (?1)   REFERENCES ? (?1))
✂️ c) CREATE TABLE X (
     X1    INTEGER NOT NULL,
     X2    INTEGER,
     X3    INTEGER,
     ?1    INTEGER,
     S1    INTEGER,
     CONSTRAINT X_PK PRIMARY KEY (x1),
     CONSTRAINT X_FK FOREIGN KEY (?1) REFERENCES ? (?1))
     CREATE TABLE Y (
     Y1    INTEGER NOT NULL,
     Y2    INTEGER NOT NULL,
     Y3    INTEGER,
     X1    INTEGER NOT NULL,
     R1    INTEGER,
     CONSTRAINT   Y_PK PRIMARY KEY (Y1,Y2),
     CONSTRAINT   Y_UK1 UNIQUE (X1),
       CONSTRAINT   Y_FK1 FOREIGN KEY (X1) REFERENCES X (X1))
     CREATE TABLE ? (
     ?1    INTEGER NOT NULL,
     ?2    INTEGER,
     CONSTRAINT ?_PK PRIMARY KEY (?1))
✂️ d) CREATE TABLE XY (
     Y1    INTEGER NOT NULL,
     Y2    INTEGER NOT NULL,
     Y3    INTEGER,
     X1    INTEGER NOT NULL,
     X2    INTEGER,
     X3    INTEGER,
     R1    INTEGER,
         S1    INTEGER,
     ?1    INTEGER NOT NULL,
     CONSTRAINT XY_PK   PRIMARY KEY (Y1,Y2,X1),
     CONSTRAINT XY_FK1 FOREIGN KEY (?1) REFERENCES ? (?1))
     CREATE TABLE ? (
     ?1    INTEGER NOT NULL,
     ?2    INTEGER,
     CONSTRAINT ?_PK PRIMARY KEY (?1))
✂️ e) CREATE TABLE X (
     X1    INTEGER NOT NULL,
     X2    INTEGER,
     X3    INTEGER,
     CONSTRAINT X_PK PRIMARY KEY (x1))
     CREATE TABLE Y (
     Y1    INTEGER NOT NULL,
     Y2    INTEGER NOT NULL,
     Y3    INTEGER,
     X1    INTEGER,
       R1    INTEGER,
     CONSTRAINT Y_PK PRIMARY KEY (Y1,Y2),
     CONSTRAINT Y_UK1 UNIQUE (X1),
     CONSTRAINT Y_FK1 FOREIGN KEY (X1) REFERENCES X (X1))
     CREATE TABLE ? (
     ?1    INTEGER NOT NULL,
     ?2    INTEGER,
     CONSTRAINT ?_PK PRIMARY KEY (?1))
     CREATE TABLE S (
     X1    INTEGER NOT NULL,
     ?1    INTEGER NOT NULL,
     S1    INTEGER,
     CONSTRAINT S_PK    PRIMARY KEY (X1),
     CONSTRAINT S_FK1   FOREIGN KEY (X1) REFERENCES X (X1),
     CONSTRAINT S_FK2   FOREIGN KEY (?1) REFERENCES ? (?1))