user: Question: How much tonnage has a Fate of Sunk, and a Flag of Great Britain, and a Date of 26 September 1940, and Deaths of 2?
Columns: ['Date', 'Ship Name', 'Flag', 'Tonnage ( GRT )', 'Fate', 'Deaths']
Types: ['text', 'text', 'text', 'real', 'text', 'real']
Sample row: ['26 September 1940', 'Ashantian', 'Great Britain', 4917.0, 'Damaged', 4.0]
SQL:

assistant: SELECT SUM("Tonnage ( GRT )") FROM "Table" WHERE "Fate" = 'Sunk' AND "Flag" = 'Great Britain' AND "Date" = '26 September 1940' AND "Deaths" = 2.0;