user: Question: What are the population densities of all communes with an are of 28.3 sq.km.?
Columns: ['Commune', 'Area (km 2 )', '2002 population', 'Pop. density (km 2 )', 'Municipality website']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Santiago (Capital)', '22.4', 200792.0, '8,963.9', 'link']
SQL:

assistant: SELECT "Pop. density (km 2 )" FROM "Table" WHERE "Area (km 2 )" = '28.3';