Table: oranje_nassau_2
Columns: ship_s_name
date_entered_service
date_withdrawn
tonnage
type_of_ship

Question: what is the sum of tonnage when the type of ship is twin screw ro-ro motorship and the date entered service is 11 february 1983?
SQL: SELECT SUM("tonnage") FROM oranje_nassau_2 WHERE "type_of_ship" = 'twin screw ro-ro motorship' AND "date_entered_service" = '11 february 1983'

Question: what is the ships name that is a twin screw ro-ro motorship and entered service on 11 february 1983?
SQL: SELECT "ship_s_name" FROM oranje_nassau_2 WHERE "type_of_ship" = 'twin screw ro-ro motorship' AND "date_entered_service" = '11 february 1983'

Question: what is the least tonnage for the ship(s) that entered service on 11 february 1983?
SQL: SELECT MIN("tonnage") FROM oranje_nassau_2 WHERE "date_entered_service" = '11 february 1983'

Question: what is the name of the ship that was withdrawn from service on 25 march 1986?
SQL: SELECT "ship_s_name" FROM oranje_nassau_2 WHERE "date_withdrawn" = '25 march 1986'

Question: what is the tonnage of the ship koningin juliana?
SQL: SELECT "tonnage" FROM oranje_nassau_2 WHERE "ship_s_name" = 'koningin juliana'