CREATE TABLE table_38648 ("Tournament" TEXT, "2006" TEXT, "2007" TEXT, "2008" TEXT, "2009" TEXT, "2010" TEXT, "2011" TEXT, "2012" TEXT)

Which 2009 has a 2008 of wta premier mandatory tournaments?
SELECT "2009" FROM table_38648 WHERE "2008" = 'wta premier mandatory tournaments'
SELECT "2009" FROM "table_38648" WHERE "2008" = 'wta premier mandatory tournaments'