Table: submarine_encounters
Columns: date
ship
nationality
tonnage
fate

Question: What was the tonnage on 30 march 1943?
SQL: SELECT AVG("tonnage") FROM submarine_encounters WHERE "date" = '30 march 1943'

Question: What was the fate on 27 june 1942?
SQL: SELECT "fate" FROM submarine_encounters WHERE "date" = '27 june 1942'

Question: What was the tonnage on 12 september 1942?
SQL: SELECT "tonnage" FROM submarine_encounters WHERE "date" = '12 september 1942'

Question: What was Yugoslavia's fate?
SQL: SELECT "fate" FROM submarine_encounters WHERE "nationality" = 'yugoslavia'