Table: election_results_1890
Columns: district
incumbent
party
first_elected
result

Question: What are incumbent William Vandever's results?
SQL: SELECT "result" FROM election_results_1890 WHERE "incumbent" = 'william vandever'

Question: Who was the first person elected from Democratic GAIN?
SQL: SELECT "first_elected" FROM election_results_1890 WHERE "result" = 'democratic gain'

Question: What was the result for incumbent Joseph McKenna who was first elected in 1884?
SQL: SELECT "result" FROM election_results_1890 WHERE "first_elected" = '1884' AND "incumbent" = 'joseph mckenna'

Question: When was republican incumbent Joseph McKenna first elected?
SQL: SELECT "first_elected" FROM election_results_1890 WHERE "party" = 'republican' AND "incumbent" = 'joseph mckenna'