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IBM DB2 9 Family Fundamentals Sample Questions:

1. Given the following two tables:
EMPLOYEE
ID NAME DEPTID
01 Mick Jagger 10 02 Keith Richards 20 03 Ronnie Wood 20 04 Charlie Watts 20 05 Bill Wyman 30 06 Brian Jones
DEPARTMENT
ID DEPTNAME
10 Executive Staff 20 Sales 30 Marketing 40 Engineering 50 Human Resources
Which two of the following queries will display the employee name and department name for all employees that are in Sales?

A) SELECT e.name,d.deptname FROM employee e RIGHT OUTER JOIN department d ON e.deptid = d.id
WHERE d.id = '20'
B) SELECT e.name,d.deptname FROM employee e INNER JOIN department d ON e.deptid = d.id WHERE d.id = '20'
C) SELECT e.name,d.deptname FROM employee e FULL OUTER JOIN department d ON e.deptid = d.id WHERE d.id = '20'
D) SELECT e.name,d.deptname FROM employee e LEFT OUTER JOIN department d ON e.deptid = d.id WHERE d.id = '20'
E) SELECT e.name,d.deptname FROM employee e, department d WHERE e.deptid = d.id AND d.id = '20'

2. 57 Given table T1 has column I1 containing the following data: I1
1
2
3
4
If the following sequence of SQL statements is applied within a single unit of work:
UPDATE t1 SET i1 = 3 WHERE i1 = 2; S
AVEPOINT s1 ON ROLLBACK RETAIN CURSORS;
UPDATE t1 SET i1 = 5 WHERE i1 = 3;
SAVEPOINT s2 ON ROLLBACK RETAIN CURSORS;
INSERT INTO t1 (i1) VALUES (6);
ROLLBACK TO SAVEPOINT s1;
UPDATE t1 SET i1 = 2 WHERE i1 = 4;
COMMIT;
What is the expected sequence of values returned from?
SELECT i1 FROM t1 ORDER BY i1

A) 1, 2, 3, 3
B) 1, 2, 2, 4
C) 1, 2, 3, 3, 6
D) 1, 2, 2, 5, 6

3. Which of the following is the main feature of an OLTP application?

A) Granular transactions
B) Voluminous historical data
C) Heterogeneous data sources
D) Summarized queries

4. Given the following tables:
CONTINENTS ID NAME COUNTRIES 1 Antarctica 0 2 Africa 53 3 Asia 47 4 Australia 14 5 Europe 43
6 North America 23 7 South America 12 REGION ID LOCATION 1 East 2 West
How many rows would be returned using the following statement?
SELECT location FROM continents, region

A) 9
B) 2
C) 14
D) 7

5. A transaction using the Read Stability isolation level scans the same table multiple times before it terminates. Which of the following can occur within this transaction's processing?

A) Rows removed by other transactions that appeared in one scan will no longer appear in subsequent scans.
B) Uncommitted changes made by other transactions can be seen from one scan to the next.
C) Rows added by other transactions that did not appear in one scan can be seen in subsequent scans.
D) Rows that have been updated can be changed by other transactions from one scan to the next.

Solutions: