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IBM DB2 9 Family Fundamentals Sample Questions:

1. Which of the following SQL statements will return the year and average salary for all employees hired within a given year that have a salary greater than $30,000?

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

2. If the following SQL statements are executed:
CREATE TABLE make (makeid SMALLINT NOT NULL PRIMARY KEY,
make VARCHAR(25));
CREATE TABLE model (modelid SMALLINT,
model VARCHAR(25),
makeid SMALLINT,
CONSTRAINT const1 FOREIGN KEY (makeid)
REFERENCES make(makeid) ON DELETE RESTRICT);
And each table created is populated as follows:
MAKE
MAKEID MAKE
1 Ford 2 Chevrolet 3 Toyota
MODEL
MODELID MODEL MAKEID
1 Mustang 1 2 Escort 1 3 Malibu 2 4 Camry 3
If the following SQL statement is executed:
DELETE FROM make WHERE makeid = 1
What is the total number of rows that will be deleted?

A) 0
B) 2
C) 3
D) 1

3. Which of the following actions may cause a trigger to be fired?

A) ROLLBACK
B) DROP
C) ALTER
D) DELETE

4. Given the following CREATE TABLE statement:
CREATE TABLE table2 LIKE table1
Which two of the following will NOT occur when the statement is executed?

A) TABLE2 will have the same column defaults as TABLE1
B) TABLE2 will have the same column names and column data types as TABLE1
C) TABLE2 will have the samenullability characteristics as TABLE1
D) TABLE2 will have the same indexes as TABLE1.
E) TABLE2 will have the same referential constraints as TABLE1

5. Application A holds a lock on a row in table TAB1. If lock timeout is set to 20, what will happen when Application B attempts to acquire a compatible lock on the same row?

A) Both applications will be rolled back if Application A still holds its lock after 20 seconds have elapsed
B) Application B will be rolled back if Application A still holds its lock after 20 seconds have elapsed
C) Application A will be rolled back if it still holds its lock after 20 seconds have elapsed
D) Application B will acquire the lock it needs

Solutions: