CREATE TABLE table_6652 ("Year" CLOB, "Men's singles" CLOB, "Women's singles" CLOB, "Men's doubles" CLOB, "Women's doubles" CLOB, "Mixed doubles" CLOB)

Who won in mixed doubles in 2008?
SELECT "Mixed doubles" FROM table_6652 WHERE "Year" = '2008'
SELECT "Mixed doubles" FROM "table_6652" WHERE "Year" = '2008'