what is the callsign whtat uses 7bu?
CREATE TABLE table_name_9 (
    callsign VARCHAR,
    on_air_id VARCHAR
)
SELECT callsign FROM table_name_9 WHERE on_air_id = "7bu"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what is the callsign whtat uses 7bu? ### Input: CREATE TABLE table_name_9 (
    callsign VARCHAR,
    on_air_id VARCHAR
) ### Response: SELECT callsign FROM table_name_9 WHERE on_air_id = "7bu"