Table: election_results_1926_4
Columns: district
incumbent
party
first_elected
result
candidates

Question: who is the the incumbent with candidates being percy e. quin (d) unopposed
SQL: SELECT "incumbent" FROM election_results_1926_4 WHERE "candidates" = 'Percy E. Quin (D) Unopposed'

Question: what's the district with candidates being john e. rankin (d) unopposed
SQL: SELECT "district" FROM election_results_1926_4 WHERE "candidates" = 'John E. Rankin (D) Unopposed'

Question: who is the the candidates with district being mississippi 4
SQL: SELECT "candidates" FROM election_results_1926_4 WHERE "district" = 'Mississippi 4'

Question: who is  the incumbent for district mississippi 4
SQL: SELECT "incumbent" FROM election_results_1926_4 WHERE "district" = 'Mississippi 4'

Question: what's the result with incumbent being bill g. lowrey
SQL: SELECT "result" FROM election_results_1926_4 WHERE "incumbent" = 'Bill G. Lowrey'

Question: what's the district  with candidates being william madison whittington (d) unopposed
SQL: SELECT "district" FROM election_results_1926_4 WHERE "candidates" = 'William Madison Whittington (D) Unopposed'