CREATE TABLE table_204_353 (id NUMBER, "no." NUMBER, "date/time" CLOB, "aircraft" CLOB, "foe" CLOB, "result" CLOB, "location" CLOB, "notes" CLOB)

when was the last battle ?
SELECT "date/time" FROM table_204_353 ORDER BY id DESC LIMIT 1
SELECT "date/time" FROM "table_204_353" ORDER BY "id" DESC FETCH FIRST 1 ROWS ONLY