10일차 # 7-21 Controlling the Order of Rows

  COLUMN a_dummy NOPRINT                --------------------> a_dummy 열을 출력하지말아라.

  SELECT 'sing' AS "My dream", 3 a_dummy

  FROM dual

  UNION

  SELECT 'I''d like to teach', 1 a_dummy

  FROM dual

  UNION 

  SELECT 'the world to', 2 a_dummy

  FROM dual

  ORDER BY a_dummy;