สร้างฟังก์ชัน Snowflake ของตัวเอง

-- calories_per_minute should take a start_time, end_time, and calories_burned
CREATE OR REPLACE FUNCTION ___(
    ___ TIMESTAMP, ___ ___, calories_burned ___
)

-- Make sure the function returns a NUMBER
RETURNS ___

AS

$$
-- Use DATEDIFF to calculate the efficiency of a workout
___(MINUTE, start_time, end_time) / calories_burned
$$;