What is Date, when Opponent is At Saskatchewan Roughriders?
CREATE TABLE table_name_13 (
    date VARCHAR,
    opponent VARCHAR
)
SELECT date FROM table_name_13 WHERE opponent = "at saskatchewan roughriders"
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 Date, when Opponent is At Saskatchewan Roughriders? ### Input: CREATE TABLE table_name_13 (
    date VARCHAR,
    opponent VARCHAR
) ### Response: SELECT date FROM table_name_13 WHERE opponent = "at saskatchewan roughriders"