user: Question: What is the Transfer fee when Summer is the Transfer window, the type is Transfer and the country is HUN?
Columns: ['Name', 'Country', 'Type', 'Moving from', 'Transfer window', 'Ends', 'Transfer fee', 'Source']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Comminges', 'GPE', 'Free Transfer', 'Swindon Town', 'Summer', 2010.0, 'Free', 'BBC Sport']
SQL:

assistant: SELECT "Transfer fee" FROM "Table" WHERE "Transfer window" = 'Summer' AND "Type" = 'Transfer' AND "Country" = 'HUN';