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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The EMPLOYEES table has these columns:
LAST NAME VARCHAR2(35) SALARY NUMBER(8,2) HIRE_DATE DATE
Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement:
ALTER TABLE EMPLOYEES MODIFY (SALARY DEFAULT 5000);
What is true about your ALTER statement?

A) Column definitions cannot be altered to add DEFAULT values.
B) A change to the DEFAULT value affects only subsequent insertions to the table.
C) Column definitions cannot be altered at add DEFAULT values for columns with a NUMBER data type.
D) All the rows that have a NULL value for the SALARY column will be updated with the value 5000.

2. Exhibit:

Examine the data in the EMPLOYEES table.
Examine the subquery:
SELECT last_name FROM employees WHERE salary IN (SELECT MAX(salary) FROM employees GROUP BY department_id);
Which statement is true?

A) The SELECT statement does not work because the GROUP BY clause should be in the
main query and not in the subquery.
B) The SELECT statement does not work because the column specified in the GROUP BY clause is not in the SELECT list.
C) The SELECT statement does not work because there is no HAVING clause.
D) The SELECT statement is syntactically accurate.

3. Examine the structure of the EMPLOYEES table:

What is the correct syntax for an inline view?

A) SELECT a.last_name, a.salary, a.department_id
FROM employees a
WHERE a.salary =
(SELECT max(salary)
FROM employees b
WHERE a.department_id = b.department_id);
B) SELECT a.last_name, a.salary, a.department_id
FROM employees a
WHERE (a.department_id, a.salary) IN
(SELECT department_id, a.salary) IN
(SELECT department_id max(salary)
FROM employees b
GROUP BY department_id
ORDER BY department_id);
C) SELECT a.last name, a.salary, a.department_id FROM employees a WHERE a.department_id IN (SELECT department_id FROM employees b GROUP BY department_id having salary = (SELECT max(salary) from employees))
D) maxsal FROM employees a, (SELECT department_id, max(salary)maxsal FROM employees GROUP BY department_id) b WHERE a.department_id = b.department_id AND a.salary < b.maxsal;
E) SELECT a.last_name, a.salary, a.department_id,

4. Management has asked you to calculate the value 12*salary* commission_pct for all the employees in the EMP table. The EMP table contains these columns:

Which statement ensures that a value is displayed in the calculated columns for all employees?

A) SELECT last_name, 12*salary*(decode(commission_pct,0)) FROM emp;
B) SELECT last_name, 12*salary* commission_pct FROM emp;
C) SELECT last_name, 12*salary*(nvl(commission_pct,0)) FROM emp;
D) SELECT last_name, 12*salary* (commission_pct,0) FROM emp;

5. The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12)
SEMESTER_END DATE
GPA NUMBER(4,3)
The registrar requested a report listing the students' grade point averages (GPA) sorted from highest grade point average to lowest.
Which statement produces a report that displays the student ID and GPA in the sorted order requested by the registrar?

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

Solutions: