Elance Exams Answers PDF file

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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?

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