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IBM DB2 9 Family Fundamentals Sample Questions:

1. Given the following table definition:
EMPLOYEES
EMPID INTEGER
NAME CHAR(20)
SALARY DECIMAL(10,2)
If the following SQL statement is executed:
CREATE UNIQUE INDEX empid_ui ON employees (empid)
Which two of the following statements are true?

A) Multiple null values are allowed in the EMPID column of the EMPLOYEES table.
B) Every value found in the EMPID column of the EMPLOYEES table will be different.
C) No other unique indexes can be created on the EMPLOYEES table.
D) No null values are allowed in the EMPID column of the EMPLOYEES table.
E) One (and only one) null value is allowed in the EMPID column of the EMPLOYEES table.

2. Which of the following is a NOT a valid reason for defining a view on a table?

A) Ensure that rows inserted remain within the scope of a definition
B) Restrict users' access to a subset of table data
C) Produce an action as a result of a change to a table
D) Provide users with an alternate view of table data

3. Given the following two tables:
TAB1 C1 C2
A 11 B 12 C 13 TAB2 CX CY
A 21 C 22 D 23
The following results are desired:
C1 C2 CX CY A 11 A 21 C 13 C 22 -- -- D 23
Which of the following queries will yield the desired results?

A) SELECT * FROM tab1 RIGHT OUTER JOIN tab2 ON c1=cx
B) SELECT * FROM tab1 LEFT OUTER JOIN tab2 ON c1=cx
C) SELECT * FROM tab1 INNER JOIN tab2 ON c1=cx
D) SELECT * FROM tab1 FULL OUTER JOIN tab2 ON c1=cx

4. When defining a referential constraint between the parent table T2 and the dependent table T1, which of the following is true?

A) The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.
B) The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.
C) The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.
D) The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.

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

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

Solutions: