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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Evaluate these two SQL statements:
SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them?

A) There is no need to specify DESC because the results are sorted in descending order by default.
B) The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
C) The two statements produce identical results.
D) The second statement returns a syntax error.

2. 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;

3. 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 SORT ORDER BY gpa ASC;
B) SELECT student_id, gpa FROM student_grades ORDER BY gpa ASC;
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 ORDER BY gpa DESC;
F) SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa DESC;

4. Which four are correct guidelines for naming database tables? (Choose four)

A) Must be 1-30 characters long.
B) Must contain only A-Z, a-z, 0-9, _, $, and #.
C) Must contain only A-Z, a-z, 0-+, _, *, and #.
D) Must begin with either a number or a letter.
E) Should not be an Oracle Server reserved word.
F) Must begin with a letter.

5. 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 stud_id_pk PRIMARY KEY student_id;
C) ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
D) ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);
E) ALTER TABLE studentsMODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);

Solutions: