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