How many opponents did they play on 17/05/2009?
CREATE TABLE table_21378160_2 (
    opponent VARCHAR,
    date VARCHAR
)
SELECT COUNT(opponent) FROM table_21378160_2 WHERE date = "17/05/2009"
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: How many opponents did they play on 17/05/2009? ### Input: CREATE TABLE table_21378160_2 (
    opponent VARCHAR,
    date VARCHAR
) ### Response: SELECT COUNT(opponent) FROM table_21378160_2 WHERE date = "17/05/2009"