user: Question: Name the least revenue for chelsea of england with rank less than 7
Columns: ['Rank', 'Team', 'Country', 'Value ($M)', 'Revenue ($M)']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'Manchester United', 'England', 2235.0, 532.0]
SQL:

assistant: SELECT MIN("Revenue ($M)") FROM "Table" WHERE "Country" = 'england' AND "Team" = 'chelsea' AND "Rank" < 7.0;