What is the average Area (in km ), when Markatal is less than 0?
CREATE TABLE table_name_81 (
    area__in_km²_ INTEGER,
    markatal INTEGER
)
SELECT AVG(area__in_km²_) FROM table_name_81 WHERE markatal < 0
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 average Area (in km ), when Markatal is less than 0? ### Input: CREATE TABLE table_name_81 (
    area__in_km²_ INTEGER,
    markatal INTEGER
) ### Response: SELECT AVG(area__in_km²_) FROM table_name_81 WHERE markatal < 0