user: Question: What is the area of Waterford?
Columns: ['County or City', 'NUTS 3 Region', 'Population (2006)', 'Area (km²)', 'Population Density', 'Principal town/city', 'Vehicle Registration Code']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['County Louth', 'Border Region', '111,267', '831.99', '133.7', 'Dundalk', 'LH']
SQL:

assistant: SELECT "Area (km²)" FROM "Table" WHERE "Principal town/city" = 'Waterford';