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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structure of the EMP_DEPT_VU view:

Which SQL statement produces an error?

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

2. You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=".
What happens when the main query is executed?

A) You cannot define a multiple-row subquery in the WHERE clause of a SQL query.
B) The main query executes with the last value returned by the subquery.
C) The main query executes with the first value returned by the subquery.
D) The main query executes with all the values returned by the subquery.
E) The main query fails because the multiple-row subquery cannot be used with the comparison operator.

3. Which three statements about subqueries are true? (Choose three)

A) A single row subquery can retrieve only one column and one row.
B) A multiple row subquery can retrieve multiple rows and multiple columns.
C) A single row subquery can retrieve only one row but many columns.
D) A multiple row subquery can use the "=" operator.
E) A single row subquery can use the IN operator.
F) A multiple row subquery can be compared by using the ">" operator.

4. Which statement explicitly names a constraint?

A) ALTER TABLE student_grades ADD NAME student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
B) ALTER TABLE student_grades ADD FOREIGN KEY (student_id) REFERENCES students(student_id);
C) ALTER TABLE student_grades ADD CONSTRAINT NAME = student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
D) ALTER TABLE student_grades ADD CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
E) ALTER TABLE student_grades ADD NAMED CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);

5. Which three statements about subqueries are true? (Choose three.)

A) Multiple columns or expression can be compared between the subquery and main query.
B) Only one column or expression can be compared between the subquery and main query.
C) A subquery can have more than one main query.
D) The subquery and main query can retrieve data from different tables.
E) A main query can have more than one subquery.
F) The subquery and main query must retrieve data from the same table.

Solutions: