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IBM DB2 9 Family Fundamentals Sample Questions:

1. Given that tables T1 and T2 contain the following rows:
Table T1: C1 C2
1 4 1 3 1 2 Table T2: C1 C2
1 1 1 2 1 3
Which of the following queries will return only those rows that exist in both T1 and T2?

A) SELECT * FROM t1 INTERSECT SELECT * FROM t2
B) SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2
C) SELECT * FROM t1 UNION SELECT * FROM t2
D) SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)

2. Given the following tables:
TABLEA
EMPIDNAME
1 USER1 2 USER2
TABLEB
EMPID WEEKNO PAYAMT
1 1 1000.00
1 2 1000.00
2 1 2000.00
and the fact that TABLEB was defined as follows:
CREATE TABLE tableb (empid SMALLINT,
weekno SMALLINT,
payamt DECIMAL(6,2),
CONSTRAINT const1 FOREIGN KEY (empid)
REFERENCES tablea(empid)
ON DELETE NO ACTION)
If the following command is issued:
DELETE FROM tablea WHERE empid=2
How many rows will be deleted from TABLEA and TABLEB?

A) TABLEA - 1, TABLEB - 1
B) TABLEA - 0, TABLEB - 0
C) TABLEA - 1, TABLEB - 0
D) TABLEA - 0, TABLEB - 1

3. Which of the following will be a consequence of defining the column IDCOL2 in TABLE2 as a foreign key referencing the primary key (IDCOL1) of TABLE1?

A) DB2 will no longer allow updating the value of IDCOL1 in TABLE1.
B) When inserting a row in TABLE2, DB2 will only allow foreign values forIDCOL2, that is values which do not exist in IDCOL1.
C) When inserting a row in TABLE2, the only values that DB2 will allow for IDCOL2 are the existing values of IDCOL1.
D) When a SELECT statement joins TABLE1 with TABLE2, DB2 will automatically add the condition TABLE1.IDCOL1=TABLE2.IDCOL2 if not specified in the statement.

4. If table TAB1 is created using the following statement:
CREATE TABLE tab1 (col1 INTEGER NOT NULL,
col2 CHAR(5),
CONSTRAINT cst1 CHECK (col1 in (1, 2, 3)))
Which of the following statements will successfully insert a record into table TAB1?

A) INSERT INTO tab1 VALUES (ABS(2), 'abc')
B) INSERT INTO tab1 VALUES (DEFAULT, 'abc')
C) INSERT INTO tab1 VALUES (0, 'abc')
D) INSERT INTO tab1 VALUES (NULL, 'abc')

5. A programmer wants to generate values for a numeric ID column in their EXPENSE table. The ID column values need to be incremented by 1000 for each new expense report added to the EXPENSE table. Which DB2 object can be referenced by an INSERT statement to meet this requirement?

A) Identity Column
B) Table Function
C) Sequence
D) INSTEAD OF Trigger

Solutions: