user: ### NOW ANSWER:
Question: What is the diameter for 1997 when longitude is 212.0E and latitude is 47.0N?
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Abe Mango Dorsa', '47.0N', '212.0E', 800.0, 1997.0]
SQL:

assistant: SELECT MIN("Diameter (km)") FROM "Table" WHERE "Year named" = 1997.0 AND "Longitude" = '212.0E' AND "Latitude" = '47.0N';