CREATE TABLE table_name_87 (call_sign VARCHAR, state VARCHAR, frequency VARCHAR)

What is the call sign for 90.9 FM which is in Florida?
SELECT call_sign FROM table_name_87 WHERE state = "florida" AND frequency = "90.9 fm"
SELECT "call_sign" FROM "table_name_87" WHERE "90.9 fm" = "frequency" AND "florida" = "state"