user: Question: What is the highest value of area when capital is San Juan?
Columns: ['Country with flag', 'Area (km²)', 'Population (1 July 2005 est.)', 'Population density (per km²)', 'Capital']
Types: ['text', 'real', 'real', 'text', 'text']
Sample row: ['Cuba', 110860.0, 11346670.0, '102.4', 'Havana']
SQL:

assistant: SELECT MAX("Area (km²)") FROM "Table" WHERE "Capital" = 'San Juan';