Table: submarine_incidents_4
Columns: date
ship_name
flag
tonnage_grt
fate
deaths

Question: Which Tonnage has a Fate of sunk, and Deaths smaller than 17, and a Date of 16 november 1940?
SQL: SELECT "tonnage_grt" FROM submarine_incidents_4 WHERE "fate" = 'sunk' AND "deaths" < 17 AND "date" = '16 november 1940'

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?
SQL: SELECT SUM("tonnage_grt") FROM submarine_incidents_4 WHERE "fate" = 'sunk' AND "flag" = 'great britain' AND "date" = '26 september 1940' AND "deaths" = 2

Question: Which tonnage has a Date of 26 september 1940, and a Ship Name of ashantian?
SQL: SELECT MIN("tonnage_grt") FROM submarine_incidents_4 WHERE "date" = '26 september 1940' AND "ship_name" = 'ashantian'