Question: What's the highest Date listed that has U-boats destroyed (Pola) of 1?
SQL: SELECT MAX("Date") FROM "2-18993668-1" WHERE "U-boats destroyed (Pola)" = '1';

Question: What is the listed Tonnage that has U-boats destroyed (KuK) of 2 and Ships sunk (Pola) of (not recorded)?
SQL: SELECT "Tonnage" FROM "2-18993668-1" WHERE "U-boats destroyed (KuK)" = '2' AND "Ships sunk (Pola)" = '(not recorded)';

Question: What is the listed Tonnage for the Date of 1914?
SQL: SELECT "Tonnage" FROM "2-18993668-1" WHERE "Date" = 1914.0;

Question: What is listed as the average Date that has U-boats destroyed (KuK) of 2 with Tonnage of 1,514,050?
SQL: SELECT AVG("Date") FROM "2-18993668-1" WHERE "U-boats destroyed (KuK)" = '2' AND "Tonnage" = '1,514,050';