What is Type, when Works Number is 'unknown'?
CREATE TABLE table_name_50 (
    type VARCHAR,
    works_number VARCHAR
)
SELECT type FROM table_name_50 WHERE works_number = "unknown"
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 Type, when Works Number is 'unknown'? ### Input: CREATE TABLE table_name_50 (
    type VARCHAR,
    works_number VARCHAR
) ### Response: SELECT type FROM table_name_50 WHERE works_number = "unknown"