When turquoise is the map colour what is the length?
CREATE TABLE table_17839_1 (
    length VARCHAR,
    map_colour VARCHAR
)
SELECT length FROM table_17839_1 WHERE map_colour = "Turquoise"
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: When turquoise is the map colour what is the length? ### Input: CREATE TABLE table_17839_1 (
    length VARCHAR,
    map_colour VARCHAR
) ### Response: SELECT length FROM table_17839_1 WHERE map_colour = "Turquoise"