CREATE TABLE table_43511 ("Season" CLOB, "Competition" CLOB, "Round" CLOB, "Opponent" CLOB, "Home" CLOB, "Away" CLOB)

Which round has an opponent of Freiburg?
SELECT "Round" FROM table_43511 WHERE "Opponent" = 'freiburg'
SELECT "Round" FROM "table_43511" WHERE "Opponent" = 'freiburg'