CREATE TABLE "by_population" (
  "province" text,
  "population" real,
  "region" text,
  "name_of_city" text,
  "districts" real
);

Question: Which district is in the province of Piura?
SQL: SELECT "districts" FROM "by_population" WHERE "province"='piura';

Question: What is the population of Chimbote?
SQL: SELECT SUM("population") FROM "by_population" WHERE "name_of_city"='chimbote';