Oracle 12c: SQL
Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 3, Problem 7MC

Which of the following commands drops any columns marked as unused from the SECUSTOMERORDERS table?

  1. a. DROP COLUMN FROM secustomerorders WHERE column_status = UNUSED
  2. b. ALTER TABLE secustomerorders DROP UNUSED COLUMNS;
  3. c. ALTER TABLE secustomerorders DROP (unused);
  4. d. DROP UNUSED COLUMNS;
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