Database: conference
Question: Show all staff names who attend a conference in 2003 or 2004.
SQL:
SELECT DISTINCT T1.name FROM staff AS T1 JOIN conference_participation AS T2 JOIN Conference AS T3 ON T1.staff_id  =  T2.staff_id AND T2.conference_id  =  T3.conference_id WHERE T3.year  =  2003 OR T3.year  =  2004