user: Question: What capital has a population of 596268?
Columns: ['Code', 'County', 'Former Province', 'Area (km 2 )', 'Population Census 2009', 'Capital']
Types: ['real', 'text', 'text', 'text', 'real', 'text']
Sample row: [18.0, 'Nyandarua', 'Central', '3,107.7', 596268.0, 'Ol Kalou']
SQL:

assistant: SELECT "Capital" FROM "Table" WHERE "Population Census 2009" = 596268.0;