Table: ship_incidents
Columns: date
name_of_ship
flag
tonnage
fate

Question: How did the ship named proletarij finish its service?
SQL: SELECT "fate" FROM ship_incidents WHERE "name_of_ship" = 'proletarij'

Question: What is the average tonnage of the ship named proletarij?
SQL: SELECT AVG("tonnage") FROM ship_incidents WHERE "name_of_ship" = 'proletarij'