Table: streymoy_demographics
Columns: name
area
inhabitants
people_per_km
main_places
regions

Question: What are the main places for the streymoy region with an area of larger than 6.1?
SQL: SELECT "main_places" FROM streymoy_demographics WHERE "regions" = 'streymoy' AND "area" > 6.1

Question: What is the sum of people per km2 for the sandoy region with an area of 112.1?
SQL: SELECT SUM("people_per_km") FROM streymoy_demographics WHERE "regions" = 'sandoy' AND "area" = 112.1