Funso (Chichewa): Kodi pali kusiyana kotani pakati pa chiwerengero chounikidwa ku Blantyre ndi Salima? 
Question (English): What is the difference between the analyzed populations for Blantyre and Salima
Table: food_insecurity (difficulty: hard)
SQL: SELECT (SELECT DISTINCT analyzed_population FROM food_insecurity WHERE district = 'Blantyre') - (SELECT DISTINCT analyzed_population FROM food_insecurity WHERE district = 'Salima');
Result: [(318936,)]