CREATE TABLE "united_states_house_of_representatives_e" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "result" text,
  "candidates" text
);

Question: In the District Tennessee 7 what is the number of first elected?
SQL: SELECT MAX("first_elected") FROM "united_states_house_of_representatives_e" WHERE "district"='Tennessee 7';

Question: What is the candidates  result that is tom j. murray (d) unopposed?
SQL: SELECT "result" FROM "united_states_house_of_representatives_e" WHERE "candidates"='Tom J. Murray (D) Unopposed';

Question: For the Republican party what are the names of the incumbents?
SQL: SELECT "incumbent" FROM "united_states_house_of_representatives_e" WHERE "party"='Republican';

Question: How many parties match the canididates listed as howard baker, sr. (r) 68.9% boyd w. cox (d) 31.1%?
SQL: SELECT COUNT("party") FROM "united_states_house_of_representatives_e" WHERE "candidates"='Howard Baker, Sr. (R) 68.9% Boyd W. Cox (D) 31.1%';