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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:
EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
HIRE_DATE DATE
NEW_EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
NAME VARCHAR2(60)
Which MERGE statement is valid?

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

2. The STUDENT_GRADES table has these columns:

The registrar has asked for a report on the average grade point average (GPA), sorted from the highest grade point average to each semester, starting from the earliest date.
Which statement accomplish this?

A) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end ASC;
B) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end ASC;
C) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end, gpa ASC
D) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end DESC;
E) SELECT student_id,semester_end,gpa FROM student_grades ORDER BY semester_end,gpa DESC
F) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end DESC, gpa DESC;

3. Which two statements are true about WHERE and HAVING clauses? (Choose two)

A) A HAVING clause CANNOT be used in subqueries.
B) A WHERE clause CANNOT be used in a query of the query uses a HAVING clause.
C) A HAVING clause can be used to restrict groups only.
D) A HAVING clause can be used to restrict both rows and groups.
E) A WHERE clause can be used to restrict both rows and groups.
F) A WHERE clause can be used to restrict rows only.

4. Examine the structure of the EMP_DEPT_VU view:

Which SQL statement produces an error?

A) SELECT *
FROM emp_dept_vu;
B) SELECT job_id, SUM(salary)
FROM emp_dept_vu
WHERE department_id IN (10,20)
GROUP BY job_id
HAVING SUM(salary) > 20000;
C) SELECT department_id, SUM(salary)
FROM emp_dept_vu
GROUP BY department_id;
D) SELECT department_id, job_id, AVG(salary)
FROM emp_dept_vu
GROUP BY department_id, job_id;
E) None of the statements produce an error; all are valid.

5. Which constraint can be defined only at the column level?

A) UNIQUE
B) NOT NULL
C) PRIMARY KEY
D) CHECK
E) FOREIGN KEY

Solutions: