How many directors for #15?
CREATE TABLE table_20942925_1 (
    directed_by VARCHAR,
    _number VARCHAR
)
SELECT COUNT(directed_by) FROM table_20942925_1 WHERE _number = 15
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 directors for #15? ### Input: CREATE TABLE table_20942925_1 (
    directed_by VARCHAR,
    _number VARCHAR
) ### Response: SELECT COUNT(directed_by) FROM table_20942925_1 WHERE _number = 15