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IBM Assessment: DB2 9 Family Fundamentals Sample Questions:

1. Given the following query:
SELECT quantity,
CASE WHEN itemcode = '099' THEN 'SILVER'
WHEN itemcode = '788' THEN 'GOLD'
WHEN itemcode = '899' THEN 'PLATINUM'
ELSE 'ERROR'
END
FROM supplier
What will be the result of the query if the following data is evaluated by the CASE expression?
SUPPLIER
QUANTITY ITEMCODE 3 099 4 099 1 788 1 899 5 009 3 788 1 899

A) 3,SILVER 4,SILVER 1,PLATINUM 1,ERROR 5,SILVER 3,GOLD 1,PLATINUM
B) 3,SILVER 4,SILVER 1,GOLD 1,PLATINUM 5,ERROR 3,GOLD 1,PLATINUM
C) 3,SILVER 4,GOLD 1,SILVER 1,GOLD 5,PLATINUM 3,SILVER 1,GOLD
D) 3,SILVER 4,SILVER 1,GOLD 1,GOLD 5,SILVER 3,ERROR 1,PLATINUM

2. Which of the following best describes a unit of work?

A) It is a recoverable sequence of operations whose point of consistency is established when an executable SQL statement is processed after a connection to a database has been established or a previous transaction has been terminated.
B) It is a recoverable sequence of operations whose current point of consistency can be determined by querying the system catalog tables.
C) It is a recoverable sequence of operations whose point of consistency is only established if a mechanism known as asavepoint is created.
D) It is a recoverable sequence of operations whose point of consistency is established when a connection to a database has been established or when a mechanism known as asavepoint is created.

3. Given the following requirements:
Create a table named TESTTAB, which has an identity column named ACTIVITYNO. Define the identity column to generate the values for the column by default. Start the values at 10 and increment by 10. Make the identity column unique.
Which of the following CREATE statements will successfully create this table?

A) CREATE TABLE TESTTAB
(ACTIVITYNO SMALLINT NOT NULL
GENERATED ALWAYS AS IDENTITY
(START WITH 10
INCREMENT BY 10),
ACTKWD CHAR(6) NOT NULL,
ACTDESC VARCHAR(20) NOT NULL,
UNIQUE(ACTIVITYNO))
B) CREATE TABLE TESTTAB
(ACTIVITYNO SMALLINT NOT NULL
GENERATED ALWAYS AS IDENTITY
(START WITH 1
INCREMENT BY 10),
ACTKWD CHAR(6) NOT NULL,
ACTDESC VARCHAR(20) NOT NULL,
UNIQUE(ACTNO))
C) CREATE TABLE TESTTAB
(ACTIVITYNO SMALLINT NOT NULL
GENERATED BY DEFAULT AS IDENTITY (START WITH 10 INCREMENT BY 1),
ACTKWD CHAR(6) NOT NULL, ACTDESC VARCHAR(20) NOT NULL, UNIQUE(ACTIVITYNO))
D) CREATE TABLE TESTTAB
(ACTIVITYNO SMALLINT NOT NULL
GENERATED BY DEFAULT AS IDENTITY
(START WITH 10
INCREMENT BY 10),
ACTKWD CHAR(6) NOT NULL,
ACTDESC VARCHAR(20) NOT NULL,
UNIQUE(ACTIVITYNO))

4. 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) Previously cached values are retained by DB2, and after the restart, will be used for values 101 to 105.
B) The next value will be 0 and DB2 will not ensure uniqueness between existing and newly generated values.
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.

5. Given the following two tables:
TAB1
COL_1 COL_2
A 10 B 12 C 14
TAB2
COL_A COL_B
A 21 C 23 D 25
Assuming the following results are desired:
COL_1 COL_2 COL_A COL_B A 10 A 21 B 12 - C 14 C 23 - - D 25
Which of the following joins will produce the desired results?

A) SELECT * FROM tab1 RIGHT OUTER JOIN tab2 ON col_1 =col_a
B) SELECT * FROM tab1 LEFT OUTER JOIN tab2 ON col_1 =col_a
C) SELECT * FROM tab1 FULL OUTER JOIN tab2 ON col_1 =col_a
D) SELECT * FROM tab1 INNER JOIN tab2 ON col_1 =col_a

Solutions: