Questão #12848552012

Banco de Dados (TI) — Sql

Seja o modelo E-R em que todas as colunas foram definidas como INTEGER, pois os tipos de dados são irrelevantes para o problema. Imagem da questão 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,

     Z1    INTEGER NOT NULL,

     CONSTRAINT XY_PK   PRIMARY KEY (Y1,Y2),

     CONSTRAINT XY_UK1 UNIQUE (X1),

     CONSTRAINT XY_FK1 FOREIGN KEY (Z1) REFERENCES Z (Z1))

     CREATE TABLE Z (

     Z1    INTEGER NOT NULL,

     Z2    INTEGER,

     CONSTRAINT Z_PK PRIMARY KEY (Z1))

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 Z (

     Z1 INTEGER NOT NULL,

     Z2 INTEGER,

     CONSTRAINT Z_PK PRIMARY KEY (Z1))

     CREATE TABLE S (

     X1    INTEGER NOT NULL,

     Z1    INTEGER NOT NULL,

     S1    INTEGER,

     CONSTRAINT S_PK PRIMARY   KEY (X1,Z1),

     CONSTRAINT S_FK1 FOREIGN KEY (X1) REFERENCES X (X1),

     CONSTRAINT S_FK2 FOREIGN KEY (Z1)   REFERENCES Z (Z1))

C CREATE TABLE X (

     X1    INTEGER NOT NULL,

     X2    INTEGER,

     X3    INTEGER,

     Z1    INTEGER,

     S1    INTEGER,

     CONSTRAINT X_PK PRIMARY KEY (x1),

     CONSTRAINT X_FK FOREIGN KEY (Z1) REFERENCES Z (Z1))

     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 Z (

     Z1    INTEGER NOT NULL,

     Z2    INTEGER,

     CONSTRAINT Z_PK PRIMARY KEY (Z1))

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,

     Z1    INTEGER NOT NULL,

     CONSTRAINT XY_PK   PRIMARY KEY (Y1,Y2,X1),

     CONSTRAINT XY_FK1 FOREIGN KEY (Z1) REFERENCES Z (Z1))

     CREATE TABLE Z (

     Z1    INTEGER NOT NULL,

     Z2    INTEGER,

     CONSTRAINT Z_PK PRIMARY KEY (Z1))

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 Z (

     Z1    INTEGER NOT NULL,

     Z2    INTEGER,

     CONSTRAINT Z_PK PRIMARY KEY (Z1))

     CREATE TABLE S (

     X1    INTEGER NOT NULL,

     Z1    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 (Z1) REFERENCES Z (Z1))

Banco de Dados (TI) — Sql

Uma questão respondida. E as próximas?