You need to design a student registration database that contains several tables storing academic
information.
The STUDENTS table stores information about a student.
The STUDENT_GRADES table stores information about the student’s grades.
Both of the tables have a column named STUDENT_ID.
The STUDENT_ID column in the STUDENTS table is a primary key.
You need to create a foreign key on the STUDENT_ID column of the STUDENT_GRADES table
that points to the STUDENT_ID column of the STUDENTS table.
Which statement creates the foreign key?
A.
CREATE TABLE student_grades
(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3),
CONSTRAINT student_id_fk REFERENCES (student_id)
FOREIGN KEY students(student_id));
B.
CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE,
gpa NUMBER(4,3), student_id_fk FOREIGN KEY (student_id) REFERENCES
students(student_id));
C.
CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE,
gpa NUMBER(4,3), CONSTRAINT FOREIGN KEY (student_id) REFERENCES
students(student_id));
D.
CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE,
gpa NUMBER(4,3), CONSTRAINT student_id_fk FOREIGN KEY (student_id)
REFERENCES students(student_id));
Explanation:
CONSTRAINT name FOREIGN KEY (column_name) REFERENCES table_name (column_name);
Incorrect answer:
Ainvalid syntax
Binvalid syntax
Cinvalid syntax