Question: In the District Tennessee 7 what is the number of first elected?
SQL: SELECT MAX("First elected") FROM "1-1342149-42" WHERE "District" = 'Tennessee 7';

Question: What is the candidates  result that is Tom J. Murray (D) Unopposed?
SQL: SELECT "Result" FROM "1-1342149-42" WHERE "Candidates" = 'Tom J. Murray (D) Unopposed';

Question: For the Republican party what are the names of the incumbents?
SQL: SELECT "Incumbent" FROM "1-1342149-42" 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 "1-1342149-42" WHERE "Candidates" = 'Howard Baker, Sr. (R) 68.9% Boyd W. Cox (D) 31.1%';