试题详情
- 单项选择题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 _ 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);
- D
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