CREATE TABLE "communes" (
  "rank" text,
  "city" text,
  "population" real,
  "area_km_2" real,
  "density_inhabitants_km_2" real,
  "altitude_mslm" real
);

Question: What is the average area of the city that has a density less than than 206.2 and an altitude of less than 85?
SQL: SELECT AVG("area_km_2") FROM "communes" WHERE "density_inhabitants_km_2"<206.2 AND "altitude_mslm"<85;

Question: What is the lowest density of alessandria where the area is bigger than 16.02 and altitude is less than 116?
SQL: SELECT MIN("density_inhabitants_km_2") FROM "communes" WHERE "area_km_2">16.02 AND "altitude_mslm"<116 AND "city"='alessandria';

Question: What is the lowest density of serravalle scrivia?
SQL: SELECT MIN("density_inhabitants_km_2") FROM "communes" WHERE "city"='serravalle scrivia';

Question: What is the lowest population of alessandria where the altitude is less than 197 and density is less than 461.8?
SQL: SELECT MIN("population") FROM "communes" WHERE "altitude_mslm"<197 AND "city"='alessandria' AND "density_inhabitants_km_2"<461.8;