How many ranks have a ationality of canada, and a Time of dns?
CREATE TABLE table_name_12 (
    rank VARCHAR,
    nationality VARCHAR,
    time VARCHAR
)
SELECT COUNT(rank) FROM table_name_12 WHERE nationality = "canada" AND time = "dns"
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 ranks have a ationality of canada, and a Time of dns? ### Input: CREATE TABLE table_name_12 (
    rank VARCHAR,
    nationality VARCHAR,
    time VARCHAR
) ### Response: SELECT COUNT(rank) FROM table_name_12 WHERE nationality = "canada" AND time = "dns"