CREATE TABLE "table1_225200_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);

Question: Name the successor for not filled this congress
SQL: SELECT "successor" FROM "table1_225200_4" WHERE "date_successor_seated"='Not filled this congress';

Question: Name the district for  rep. warren r. davis died during previous congress
SQL: SELECT "district" FROM "table1_225200_4" WHERE "reason_for_change"='Rep. Warren R. Davis died during previous congress';

Question: Name the total number of reason for change for not filled this congress
SQL: SELECT COUNT("reason_for_change") FROM "table1_225200_4" WHERE "date_successor_seated"='Not filled this congress';

Question: Name the vacator for resigned february 26, 1836 because of ill health
SQL: SELECT "vacator" FROM "table1_225200_4" WHERE "reason_for_change"='Resigned February 26, 1836 because of ill health';