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IBM DB2 9 Family Fundamentals Sample Questions:

1. Which of the following can NOT be used to restrict specific values from being inserted into a column in a particular table?

A) Check constraint
B) Referential constraint
C) Default constraint
D) Index

2. Which of the following is NOT true about schemas?

A) If a schema name is not specified, either by qualifying a database object name or by executing the SET CURRENT SCHEMA statement, the authorization ID of the current session user is used as the schema name by default
B) When most database objects are created, they are either implicitly or explicitly assigned to a schema
C) The value assigned to the CURRENT SCHEMA special register is persistent across database restarts
D) A schema enables the creation of multiple objects in a database without encountering namespace collisions

3. A user needs to create a trigger that will update table T2 whenever a row is added to table T1. Assuming the user has all appropriate privileges for table T2, which privilege is required on table T1 to create the trigger?

A) SELECT
B) REFERENCES
C) UPDATE
D) ALTER

4. Given the following statement:
SELECT hyear, AVG(salary)
FROM (SELECT YEAR(hiredate) AS hyear, salary
FROM employee WHERE salary > 30000)
GROUP BY hyear
Which of the following describes the result if this statement is executed?

A) The statement will return the year and average salary for all years that every employee hired had a salary greater than $30,000.
B) The statement will return the year and average salary for all employees hired within a given year that have a salary greater than $30,000.
C) The statement will return the year and average salary for all years that any employee had a salary greater than $30,000.
D) The statement will return the year and average salary for all employees that have a salary greater than $30,000, sorted by year.

5. If the following SQL statements are executed in the order shown:
CREATE TABLE table1 (c1 INTEGER, c2 INTEGER);
INSERT INTO table1 VALUES (123, 456);
UPDATE table1 SET c1 = NULL;
What will be the result of the following statement?
SELECT * FROM table1;

A) C1 C2
123 456
1 record(s) selected.
B) C1 C2
NULL 456 1 record(s) selected.
C) C1 C2
-
456
1 record(s) selected.
D) C1 C2
0 456
1 record(s) selected.

Solutions: