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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which SQL statement defines the FOREIGN KEY constraint on the DEPTNO column of the EMP table?

A) CREATE TABLE EMP (empno NUMBER(4),
ename VARCHAR2(35),
deptno NUMBER(7,2) FOREIGN KEY
CONSTRAINT emp deptno fk REFERENCES dept (deptno));
B) CREATE TABLE EMP
(empno NUMBER(4)
ename VARCHAR2(35),
deptno NUMBER(7,2) NOT NULL,
CONSTRAINT emp_deptno_fk REFERENCES dept (deptno)
FOREIGN KEY (deptno));
C) CREATE TABLE EMP
(empno NUMBER(4),
ename VARCHAR2(35),
deptno NUMBER(7,2)
CONSTRAINT emp_deptno_fk REFERENCES dept (deptno));
D) CREATE TABLE EMP
(empno NUMBER(4),
ename VARCHAR2(35),
deptno NUMBER(7,2) NOT NULL
CONSTRAINT emp_deptno_fk FOREIGN KEY deptno
REFERENCES dept deptno);

2. Examine the structure of the STUDENTS table:

You need to create a report of the 10 students who achieved the highest ranking in the course INT SQL and who completed the course in the year 1999.
Which SQL statement accomplishes this task?

A) SELECT student_id, marks, ROWID "Rank"
FROM students
WHERE ROWID <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks;
B) SELECT student_ id, marks, ROWNUM "Rank"
FROM students
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks DESC;
C) SELECT student_id, marks, ROWNUM "Rank"
FROM (SELECT student_id, marks
FROM students
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND
'31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks DESC);
D) SELECT student_id, marks, ROWNUM "Rank"
FROM (SELECT student_id, marks
FROM students
ORDER BY marks DESC)
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL';

3. Examine the description of the EMPLOYEES table:
EMP_ID NUMBER(4) NOT NULL
LAST_NAME VARCHAR2(30) NOT NULL
FIRST_NAME VARCHAR2(30)
DEPT_ID NUMBER(2)
Which statement produces the number of different departments that have employees with last name Smith?

A) SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith';
B) SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith';
C) SELECT COUNT (dept_id) FROM employees WHERE last_name='Smith';
D) SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith';
E) SELECT COUNT(*) FROM employees WHERE last_name='Smith';

4. You would like to display the system date in the format "Monday, 01 June, 2001".
Which SELECT statement should you use?

A) SELECT TO_CHAR(SYSDATE, 'FMDY, DDD Month, YYYY') FROM dual;
B) SELECT TO_DATE(SYSDATE, 'FMDAY, DD Month, YYYY') FROM dual;
C) SELECT TO_CHAR(SYSDATE, 'FMDD, DY Month, 'YYYY') FROM dual;
D) SELECT TO_CHAR(SYSDATE, 'FMDay, DD Month, YYYY') FROM dual;
E) SELECT TO_DATE(SYSDATE, 'FMDY, DDD Month, YYYY') FROM dual;

5. In which case would you use a FULL OUTER JOIN?

A) Both tables have NULL values.
B) You want all unmatched data from both tables.
C) You want all matched and unmatched data from only one table.
D) You want all matched data from both tables.
E) You want all unmatched data from one table.
F) One of the tables has more data than the other.

Solutions: