Online 1Z0-082 Practice Test

Question 1

Examine the description of the BOOKS table:

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The table has 100 rows.

Examine this sequence of statements issued in a new session:

INSERT INTO books VALUES ('ADV112', 'Adventures of Tom Sawyer', NULL, NULL);

SAVEPOINT a;

DELETE FROM books;

ROLLBACK TO SAVEPOINT a;

ROLLBACK;

Which two statements are true? (Choose two.)

Options :

A : The second ROLLBACK command does nothing

B : The second ROLLBACK command replays the delete

C : The first ROLLBACK command restores the 101 rows that were deleted, leaving the inserted row still to be committed

D : The second ROLLBACK command undoes the insert

E : The first ROLLBACK command restores the 101 rows that were deleted and commits the inserted row

Answer: C,D

Question 2

Which statement is true about aggregate functions?

Options :

A : Aggregate functions can be nested to any number of levels

B : The AVG function implicitly converts NULLS to zero

C : Aggregate functions can be used in any clause of a SELECT statement

D : The MAX and MIN functions can be used on columns with character data types

Answer: D

Question 3

Examine this SQL statement:

SELECT cust_id, cust_last_name ''Last Name''

FROM customers

WHERE country_id = 10

UNION

SELECT cust_id CUST_NO, cust_last_name

FROM customers

WHERE country_id = 30

Identify three ORDER BY clauses, any one of which can complete the query successfully. (Choose three.)

Options :

A : ORDER BY ''Last Name''

B : ORDER BY 2, 1

C : ORDER BY 2, cust_id

D : ORDER BY CUST_NO

E : ORDER BY ''CUST_NO''

Answer: B,C,D

Question 4

Evaluate these commands which execute successfully:

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Which two statements are true about the ORD_ITEMS table and the ORD_SEQ sequence? (Choose two.)

Options :

A : If sequence ORD_SEQ is dropped then the default value for column ORD_NO will be NULL for rows inserted into ORD_ITEMS

B : Any user inserting rows into table ORD_ITEMS must have been granted access to sequence ORD_SEQ

C : Column ORD_NO gets the next number from sequence ORD_SEQ whenever a row is inserted into ORD_ITEMS and no explicit value is given for ORD_NO

D : Sequence ORD_SEQ cycles back to 1 after every 5000 numbers and can cycle 20 times

E : Sequence ORD_SEQ is guaranteed not to generate duplicate numbers

Answer: B,C

Question 5

Which two statements are true regarding the UNION and UNION ALL operators? (Choose two.)

Options :

A : Duplicates are eliminated automatically by the UNION ALL operator

B : The number of columns selected in each SELECT statement must be identical

C : The names of columns selected in each SELECT statement must be identical

D : The output is sorted by the UNION ALL operator

E : NULLS are not ignored during duplicate checking

Answer: A,B

EXPERTY DESIGNED 1Z0-082 PRACTICE TEST