question: What is the lowest Population (1 July 2005 est.), when Population density (per km²) is 0?
answer: SELECT MIN(population__1_july_2005_est_) FROM table_name_5 WHERE population_density__per_km²_ = 0
context: CREATE TABLE table_name_5 (population__1_july_2005_est_ INTEGER, population_density__per_km²_ VARCHAR)