Table: election_results_1922
Columns: district
incumbent
party
first_elected
result
candidates

Question: How many candidates won the election of john n. sandlin?
SQL: SELECT COUNT("candidates") FROM election_results_1922 WHERE "incumbent" = 'John N. Sandlin'

Question: Who was the incumbent in the election of henry garland dupré (d) unopposed?
SQL: SELECT "incumbent" FROM election_results_1922 WHERE "candidates" = 'Henry Garland Dupré (D) Unopposed'