user: Question: What is the highest rank for the airport with a code of HKG/VHHH?
Columns: ['Rank', 'Airport', 'Code (IATA/ICAO)', 'Total Cargo (Metric Tonnes)', '% Change']
Types: ['real', 'text', 'text', 'real', 'text']
Sample row: [1.0, 'Hong Kong International Airport', 'HKG/VHHH', 3968397.0, '4.7%']
SQL:

assistant: SELECT MAX("Rank") FROM "Table" WHERE "Code (IATA/ICAO)" = 'HKG/VHHH';