CREATE TABLE "passenger_ships" (
  "ship" text,
  "built" real,
  "in_service_for_nal" text,
  "type" text,
  "tonnage" text
);

Question: The ship MS Vistafjord has what in service for NAL?
SQL: SELECT "in_service_for_nal" FROM "passenger_ships" WHERE "ship"='ms vistafjord';

Question: The ship SSBergensfjord built before 1973 has what tonnage?
SQL: SELECT "tonnage" FROM "passenger_ships" WHERE "built"<1973 AND "ship"='ssbergensfjord';