CREATE TABLE table_37949 ("Tournament" TEXT, "1998" TEXT, "1999" TEXT, "2000" TEXT, "2001" TEXT, "2002" TEXT, "2003" TEXT, "2004" TEXT, "2005" TEXT, "2006" TEXT, "2007" TEXT, "2008" TEXT, "2009" TEXT, "2010" TEXT, "2011" TEXT)

Which 2008 had a 1998 and 2006 that were a when 2009 was sf?
SELECT "2008" FROM table_37949 WHERE "1998" = 'a' AND "2009" = 'sf' AND "2006" = 'a'
SELECT "2008" FROM "table_37949" WHERE "1998" = 'a' AND "2006" = 'a' AND "2009" = 'sf'