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IBM Assessment: DB2 9 Family Fundamentals Sample Questions:

1. Given the following ALTER SEQUENCE statement: ALTER SEQUENCE myseq RESTART WITH 0 INCREMENT BY 1 NO MAXVALUE CACHE 5 ORDER Assuming that the sequence had reached a value of 100 prior to the RESTART, which of the following is true?

A) The next value will be 0 and DB2 will not ensure uniqueness between existing and newly generated values.
B) Previously cached values are retained by DB2, and after the restart, will be used for values 101 to 105.
C) The next value will be 0 and the sequence will never use the values 101 to 105.
D) The next value will be 101 to ensure uniqueness between existing and newly generated sequence values.

2. Which of the following is NOT a difference between a unique index and a primary key?

A) Unique indexes can be defined over one or more columns; primary keys can only be defined on a single column.
B) Unique indexes can be defined over one or more columns that allow null values; primary keys cannot contain null values.
C) A primary key is a special form of a unique constraint; both use a unique index.
D) A table can have many unique indexes but only one primary key.

3. On which of the following database objects may the SELECT privilege be controlled?

A) Schema
B) Sequence
C) View
D) Group

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

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

Solutions: