Oracle Exam options for managing an item hierarchy - mcsaclass.com

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Oracle Exam options for managing an item hierarchy

Which statement about SQL is true?

A. Null values are displayed last in the ascending sequences.
B. Data values are displayed in descending order by default.
C. You cannot specify a column alias in an ORDER BY clause.
D. You cannot sort query results by a column that is not included in the SELECT list.
E. The results are sorted by the first column in the SELECT list, if the ORDER BY
clause is not provided.

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Answer: A

Explanation:
Answer A is correct because of null values are displayed last in the ascending sequences.
Incorrect Answers:
B: Data values are displayed in ASCENDING order by default.
C: It is possible to specify a column alias in an ORDER BY clause (but not in a GROUP
BY clause).
D: You can sort query results by a column that is not included in the SELECT list.
E: The results will not be sorted at all, if the ORDER BY clause was not used in query.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 18-19
Chapter 8: Selecting Data from Oracle