user: Question: Name the most overall rank for Czech Republic
Columns: ['Overall rank', 'Country', 'Overall life expectancy', 'Male life expectancy', 'Male rank', 'Female life expectancy', 'Female rank']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Japan', 83.0, 79.0, 12.0, 86.0, 1.0]
SQL:

assistant: SELECT MAX("Overall rank") FROM "Table" WHERE "Country" = 'Czech Republic';