CREATE TABLE table_43551 ("Date" CLOB, "Round" CLOB, "Opponent" CLOB, "Venue" CLOB, "Result" CLOB, "Attendance" FLOAT, "Scorers" CLOB)

What venue had SF?
SELECT "Venue" FROM table_43551 WHERE "Round" = 'sf'
SELECT "Venue" FROM "table_43551" WHERE "Round" = 'sf'