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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?
Correct Answer: A
Explanation/Reference: Explanation: the two statement produce identical results as ORDER BY 2 will take the second column as sorting column. Incorrect answer: B. there is no syntax error C. result are sorted in ascending order by default D. ORDER BY 2 will take the second column as sorting column. Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 2-22