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IBM DB2 9 Family Fundamentals Sample Questions:

1. Given the following CREATE TABLE statement:
CREATE TABLE EMPLOYEE
(EMPNO CHAR(3) NOT NULL,
FIRSTNAME CHAR(20) NOT NULL,
MIDINIT CHAR(1),
LASTNAME CHAR(20) NOT NULL,
SALARY DECIMAL(10, 2))
Which of the following will retrieve the rows that have a missing value in the MIDINIT column?

A) SELECT * FROM employee WHEREmidinit = " "
B) SELECT * FROM employee WHEREmidinit IS NULL
C) SELECT * FROM employee WHEREmidinit = ' '
D) SELECT * FROM employee WHEREmidinit = NULL

2. Given the following CREATE TABLE statement:
CREATE TABLE customer(custid INTEGER, info XML)
And the following INSERT statements:
INSERT INTO customer VALUES (1000,
'<customerinfo xmlns="http://custrecord.dat" custid="1000">
<name>John Doe</name>
<addr country="United States">
<street>25 East Creek Drive</street>
<city>Raleigh</city>
<state-prov>North Carolina</state-prov>
<zip-pcode>27603</zip-pcode>
</addr>
<phone type="work">919-555-1212</phone>
<email>[email protected]</email>
</customerinfo>');
INSERT INTO customer VALUES (1000,
'<customerinfo xmlns="http://custrecord.dat" custid="1001">
<name>Paul Smith</name>
<addr country="Canada">
<street>412 Stewart Drive</street>
<city>Toronto</city>
<state-prov>Ontario</state-prov>
<zip-pcode>M8X-3T6</zip-pcode>
</addr>
<phone type="work">919-555-4444</phone>
<email>[email protected]</email>
</customerinfo>');
What is the result of the following XQuery expression?
XQUERY declare default element namespace "http://custrecord.dat"; for
$info in db2-fn:xmlcolumn('CUSTOMER.INFO')/customerinfo where
$info/addr/state-prov="Ontario" return $info/name/text();

A) Paul Smith
B) <customerinfo xmlns="http://custrecord.dat" custid="1001"><name xmlns="http://custrecord.dat">Paul Smith</name>
C) <namexmlns="http://custrecord.dat">Paul Smith</name>
D) <customerinfo xmlns="http://custrecord.dat" custid="1001">Paul Smith</customerinfo>

3. Consider the following table called EMPLOYEES:
ID FIRSTNAME LASTNAME JOB LEVEL
1 Paul Jones DBA 2 2 George Baker MGR 1 3 Roger Melvin CLERK 3 4 Jim Smith MGR 1 5 Kevin Street CLERK 3 6 Chris Eaton MGR 1
If the following SQL statement is executed, how many rows will be deleted? DELETE FROM employees WHERE 1 = 1

A) 3
B) 6
C) 1
D) 0

4. Assuming table TAB1 contains 100 rows, which of the following queries will return only half of the rows available?

A) SELECT * FROM tab1 FIND FIRST 50 ROWS
B) SELECT * FROM tab1 FETCH FIRST 50 ROWS ONLY
C) SELECT * FROM tab1 WHILE ROW_NUM < 50
D) SELECT * FROM tab1 MAXROWS 50

5. If the following SQL statements are executed in the order shown:
CREATE TABLE orders (order_num INTEGER NOT NULL, buyer_name VARCHAR(35), amount NUMERIC(5,2));
CREATE UNIQUE INDEX idx_orderno ON orders (order_num);
Which of the following describes the resulting behavior?

A) Duplicate ORDER_NUM values are allowed; no other index can be created for the ORDERS table that reference the ORDER_NUM column
B) Every ORDER_NUM value entered must be unique; no other index can be created for the ORDERS table that reference the ORDER_NUM column
C) Every ORDER_NUM value entered must be unique; whenever the ORDERS table is queried rows will be displayed in no particular order
D) Every ORDER_NUM value entered must be unique; whenever the ORDERS table is queried rows should be displayed in order of increasing ORDER_NUM values

Solutions: