user: Question: tell me the name of the capital with an area of 20,4.
Columns: ['car plates (since 1937)', 'Voivodeship Separate city', 'Capital', 'Area in 1000km² (1930)', 'Population in 1000 (1931)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['car plates (since 1937)', 'Voivodeship Separate city', 'Capital', 'Area in 1000km² (1930)', 'Population in 1000 (1931)']
SQL:

assistant: SELECT "Capital" FROM "Table" WHERE "Area in 1000km² (1930)" = '20,4';