Table: election_results_1952_6
Columns: district
incumbent
party
first_elected
result
candidates

Question: In the District Tennessee 7 what is the number of first elected?
SQL: SELECT MAX("first_elected") FROM election_results_1952_6 WHERE "district" = 'Tennessee 7'

Question: What is the candidates  result that is tom j. murray (d) unopposed?
SQL: SELECT "result" FROM election_results_1952_6 WHERE "candidates" = 'Tom J. Murray (D) Unopposed'

Question: For the Republican party what are the names of the incumbents?
SQL: SELECT "incumbent" FROM election_results_1952_6 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 election_results_1952_6 WHERE "candidates" = 'Howard Baker, Sr. (R) 68.9% Boyd W. Cox (D) 31.1%'