Which statement accomplishes this task?

You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The

table is currently empty.
Which statement accomplishes this task?

You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The

table is currently empty.
Which statement accomplishes this task?

A.
ALTER TABLE students ADD PRIMARY KEY student_id;

B.
ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);

C.
ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;

D.
ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);

E.
ALTER TABLE students MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);

Explanation:
ALTER TABLE table_name
ADD [CONSTRAINT constraint] type (coloumn);
Incorrect answer:
Awrong syntax
Bwrong syntax
Cwrong syntax
Eno such MODIFY keyword
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 10-17



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