Table: med_uboats_campaign
Columns: date
ships_sunk_pola
tonnage
u_boats_destroyed_kuk
u_boats_destroyed_pola

Question: What's the highest Date listed that has U-boats destroyed (Pola) of 1?
SQL: SELECT MAX("date") FROM med_uboats_campaign 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 med_uboats_campaign 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 med_uboats_campaign WHERE "date" = 1914

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 med_uboats_campaign WHERE "u_boats_destroyed_kuk" = '2' AND "tonnage" = '1,514,050'