Question: What was the average tonnage for the Siljan ship from Sweden?
SQL: SELECT AVG("Tonnage") FROM "2-17235399-1" WHERE "Nationality" = 'Sweden' AND "Name of ship" = 'Siljan';

Question: What was the average tonnage for Beatus, raided on 18 October 1940?
SQL: SELECT AVG("Tonnage") FROM "2-17235399-1" WHERE "Date" = '18 October 1940' AND "Name of ship" = 'Beatus';

Question: Which ship had a tonnage over 8782?
SQL: SELECT "Name of ship" FROM "2-17235399-1" WHERE "Tonnage" > 8782.0;

Question: Which ship was raided on 26 September 1940?
SQL: SELECT "Name of ship" FROM "2-17235399-1" WHERE "Date" = '26 September 1940';