Questões de Concurso

No contexto da modelagem de dados, analise o diagrama a seguir, de acordo com a notação IDEF1X.

Os comandos SQL que estabelecem corretamente a implementação desse modelo de dados são:

(a)

create table E1 (A1 int not null, B1 int,

constraint PK1 primary key(A1))

create table E2 (A2 int not null, A1 int not null, B2 int,

constraint PK2 primary key(A2),

constraint FK foreign key(A1) references E1(A1))

(b)

create table E1 (A1 int not null, B1 int,

constraint PK1 primary key(A1),

constraint FK foreign key(A1) references E2(A1))

create table E2 (A2 int not null, A1 int not null, B2 int,

constraint PK2 primary key(A2, A1))

(c)

create table E1 (A1 int not null, B1 int,

constraint PK1 primary key(A1))

create table E2 (A2 int not null, A1 int not null, B2 int,

constraint PK2 primary key(A2),

constraint FK foreign key(A1) references E1(B1))

(d)

create table E1 (A1 int not null, B1 int,

constraint PK1 primary key(A1))

create table E2 (A2 int not null, A1 int not null, B2 int,

constraint PK2 primary key(A2, A1),

constraint FK foreign key(A1) references E1(A1))

(e)

create table E1 (A1 int not null, B1 int,

constraint PK1 primary key(A1),

constraint FK foreign key(A1) references E2(A1))

create table E2 (A2 int not null, A1 int not null, B2 int,

constraint PK2 primary key(A2, A1),

constraint FK foreign key(A1) references E1(A1))