user: Question: What is the sum of the round with the Defenceman?
Columns: ['Round', 'Player', 'Position', 'Nationality', 'College/Junior/Club Team']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'David Legwand', 'Center', 'United States', 'Plymouth Whalers (OHL)']
SQL:

assistant: SELECT SUM("Round") FROM "Table" WHERE "Position" = 'Defenceman';