Funso (Chichewa): Ndi boma liti lomwe likuwonetsa kusiyana kochepa kwambiri kwa mtengo wa chimanga?
Question (English): Which district shows the smallest variation in maize prices?
Table: commodity_prices (difficulty: medium)
SQL: SELECT district, (MAX(price) - MIN(price)) FROM commodity_prices WHERE commodity = 'Maize' GROUP BY district ORDER BY (MAX(price) - MIN(price)) ASC LIMIT 1;
Result: [('Rumphi', 57.27)]