SELECT course_id FROM SECTION WHERE semester  =  'Fall' AND YEAR  =  2009 UNION SELECT course_id FROM SECTION WHERE semester  =  'Spring' AND YEAR  =  2010
Find courses that ran in Fall 2009 or in Spring 2010.
SELECT course_id FROM SECTION WHERE semester = 'Fall ' AND YEAR = 2009 UNION SELECT course_id FROM SECTION WHERE semester = 'Spring ' AND YEAR = 2010
select course_id from section where semester = value and year = value union select course_id from section where semester = value and year = value
Find courses that ran in Fall 2009 or in Spring 2010 .