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Oracle Training Use RMAN to migrate your database to ASM

Evaluate these two SQL statements:
SELECT last_name, salary , hire_date
FROM EMPLOYEES
ORDER BY salary DESC;
SELECT last_name, salary, hire_date
FROM EMPLOYEES
ORDER BY 2 DESC;
What is true about them?

A. The two statements produce identical results.
B. The second statement returns a syntax error.
C. There is no need to specify DESC because the results are sorted in descending order by default.
D. The two statements can be made to produce identical results by adding a column alias for the salary column
in the second SQL statement.

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Answer: A

Explanation:
These two statements produce identical results, because it is possible even to use numbers to indicate the
column position where Oracle should order the output from a statement.
Incorrect Answers
B: Second statement is correct and it will not return a syntax error.
C: The results are sorted in ascending order by default.
D: There is no corrections need to be made for the statements. They will return identical results.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 56-61
Chapter 2: Limiting, Sorting, and Manipulating Return Data