user: Question: What is the density of San Sebastián?
Columns: ['City district', 'Area km²', 'Population 2007 census(hab)', 'Housing (2007)', 'Density (hab/km²)', 'Elevation msl']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Cuzco', '116.22km²', '108,798*', '28,476', '936.1', '3,399 msl']
SQL:

assistant: SELECT "Density (hab/km²)" FROM "Table" WHERE "City district" = 'San Sebastián';