Table: iceland_regions
Columns: col
name
name_english
population_2008_07_01
area_km
pop_km
iso_3166_2
administrative_centre

Question: when administrative centre is egilsstaðir, what is the pop./ km²?
SQL: SELECT COUNT("pop_km") FROM iceland_regions WHERE "administrative_centre" = 'Egilsstaðir'

Question: when the name is southern region, what is the administrative centre?
SQL: SELECT "administrative_centre" FROM iceland_regions WHERE "name_english" = 'Southern Region'

Question: when the area (km²) is 22721, what is the pop./ km²?
SQL: SELECT "pop_km" FROM iceland_regions WHERE "area_km" = 22721

Question: What is the max pop of 2008 for selfoss?
SQL: SELECT MAX("population_2008_07_01") FROM iceland_regions WHERE "administrative_centre" = 'Selfoss'

Question: When the # is 4, what is the pop./ km²?
SQL: SELECT "pop_km" FROM iceland_regions WHERE "col" = 4