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NO.1 What is true about sequences?
A. Only the DBA can control which sequence is used by a certain table.
B. Once created, a sequence is linked to a specific table.
C. Once created, a sequence is automatically available to all users.
D. Once created, a sequence is automatically used in all INSERT and UPDATE statements.
E. Once created, a sequence belongs to a specific schema.
Answer: E

1Z0-051 testdump   

NO.2 Top N analysis requires _____ and _____. (Choose two.)
A. an ORDER BY clause
B. a GROUP BY clause
C. an inline view and an outer query
D. the use of rowid
E. only an inline view
Answer: A,C

1Z0-051 quality   
Explanation:
The correct statement for Top-N Analysis
SELECT [coloumn_list], ROWNUM
FROM (SELECT [coloumn_list]
FROM table
ORDER BY Top-N_coloumn)
WHERE ROWNUM <= N;
Incorrect answer:
AROWID is not require
BGROUP BY clause is not require
DMust have inline view and outer query.
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 11-23

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