Write SQL query to solve given problem: Calculate difference between business that have the highest number of reviews and business that have the lowest number of reviews.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT ( SELECT COUNT(business_id) FROM Reviews GROUP BY business_id ORDER BY COUNT(business_id) DESC LIMIT 1 ) - ( SELECT COUNT(business_id) FROM Reviews GROUP BY business_id ORDER BY COUNT(business_id) ASC LIMIT 1 ) AS DIFF