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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. You need to design a student registration database that contains several tables storing academic information.
The STUDENTS table stores information about a student. The STUDENT_GRADES table stores information about the student's grades. Both of the tables have a column named STUDENT_ID. The STUDENT_ID column in the STUDENTS table is a primary key.
You need to create a foreign key on the STUDENT_ID column of the STUDENT_GRADES table that points to the STUDENT_ID column of the STUDENTS table. Which statement creates the foreign key?

A) CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id));
B) CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT FOREIGN KEY (student_id) REFERENCES students(student_id));
C) CREATE TABLE student_grades (student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk REFERENCES (student_id) FOREIGN KEY students(student_id));
D) CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id));

2. You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created.
You want to look at the definition of the view (the SELECT statement on which the view was create.)
How do you obtain the definition of the view?

A) Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.
B) Use the DESCRIBE VIEW command on the EMP_DEPT VU view.
C) Use the DESCRIBE command in the EMP_DEPT VU view.
D) Use the DEFINE VIEW command on the EMP_DEPT VU view.
E) Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.
F) Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.

3. Examine the structure of the EMPLOYEES table:

You want to create a SQL script file that contains an INSERT statement. When the script is run, the INSERT statement should insert a row with the specified values into the EMPLOYEES table. The INSERT statement should pass values to the table columns as specified below: Which INSERT statement meets the above requirements?

A) INSERT INTO (SELECT *
FROM employees
WHERE (department_id = 20 AND
department_id = 50)
WITH CHECK OPTION )
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);
B) INSERT INTO (SELECT *
FROM employees
WHERE department_id IN (20,50)
WITH CHECK OPTION)
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);
C) INSERT INTO employees
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid',
2000, NULL, &did IN (20,50));
D) INSERT INTO (SELECT *
FROM employees
WHERE department_id IN (20,50))
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);
E) INSERT INTO employees
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);

4. You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows.
Which statement is valid?

A) ALTER TABLE commercials
MODIFY (description CHAR2(2000));
B) ALTER TABLE commercials
CHANGE (description CHAR2(2000));
C) ALTER TABLE commercials
CHANGE (description VARCHAR2(2000));
D) You cannot increase the size of a column if the table has rows.
E) ALTER TABLE commercials
MODIFY (description VARCHAR2(2000));

5. Examine the structure of the EMPLOYEES and NEW EMPLOYEES tables:

Which MERGE statement is valid?

A) name = e.first_name ||','|| e.last_name
WHEN NOT MATCHED THEN
INSERT VALUES(e.employee_id, e.first_name ||',
'||e.last_name);
B) name = e.first_name ||','|| e.last_name
WHEN NOT MATCHED THEN
INSERT INTO new_employees VALUES(e.employee_id, e.first_name ||'.'||e.last_name);
C) MERGE INTO new_employees c
USING employees e
ON (c.employee_id = e.employee_id)
WHEN MATCHED THEN
UPDATE SET
D) MERGE new_employees c
USING employees e
ON (c.employee_id = e.employee_id)
WHEN EXIST THEN
UPDATE SET
E) MERGE new_employees c
FROM employees e
ON (c.employee_id = e.employee_id)
WHEN MATCHED THEN
UPDATE SET
F) name = e.first_name ||','|| e.last_name
WHEN NOT MATCHED THEN
INSERT VALUES(e.employee_id, e.first_name ||',
'||e.last_name);
G) MERGE INTO new employees c
USING employees e
ON (c.employee_id = e.employee_id)
WHEN EXISTS THEN
UPDATE SET
H) name = e.first_name ||','|| e.last_name
WHEN NOT MATCHED THEN
INSERT VALUES(e.employee_id, e.first_name ||',
'||e.last_name);

Solutions: