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Oracle Database 10g: SQL Fundamentals I
Oracle Training Manage the recycle bin
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);
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Answer: D
Explanation:
This statement provides correct syntax to add a primary key on the STUDENT_ID column of the STUDENT
table.
Incorrect Answers
A: This ALTER TABLE statement is missing CONSTRAINT keyword and the name of the constraint.
B: This ALTER TABLE statement is missing the name of the constraint.
C: It's incorrect syntax in the ALTER TABLE command: STUDENT_ID must be used with brackets.
E: We need to add constraint, not to modify existing one. Usage of the MODIFY keyword is incorrect in this
case.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 239-240
Chapter 5: Creating Oracle Database Objects