What is the pick number of the defensive back?
CREATE TABLE table_12165135_1 (
    overall_pick__number VARCHAR,
    position VARCHAR
)
SELECT COUNT(overall_pick__number) FROM table_12165135_1 WHERE position = "Defensive Back"
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 pick number of the defensive back? ### Input: CREATE TABLE table_12165135_1 (
    overall_pick__number VARCHAR,
    position VARCHAR
) ### Response: SELECT COUNT(overall_pick__number) FROM table_12165135_1 WHERE position = "Defensive Back"