user: Question: What is the sum of the weight of the race with a 1st pos'n and a 8f distance?
Columns: ['Result', 'Race', 'Distance', 'Weight', 'Winner or 2nd', "Pos'n"]
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['–', 'AJC Denham Court Hcp', '6f', 7.2, 'Killarney', '1st']
SQL:

assistant: SELECT SUM("Weight") FROM "Table" WHERE "Pos'n" = '1st' AND "Distance" = '8f';