user: Question: How big (in km2) is the district with a code BW?
Columns: ['Code', 'District', 'Headquarters', 'Population (2001 Census)', 'Population (2011 Census)', 'Area (km²)', 'Density in 2011 (/km²)']
Types: ['text', 'text', 'text', 'real', 'real', 'real', 'text']
Sample row: ['AN', 'Anugul', 'Anugul', 1140003.0, 1273821.0, 6375.0, '199.8']
SQL:

assistant: SELECT "Area (km²)" FROM "Table" WHERE "Code" = 'BW';