CREATE TABLE "iowa" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "results" text
);

Question: What were the results for the incumbent from Iowa 2 district?
SQL: SELECT "results" FROM "iowa" WHERE "district"='iowa 2';

Question: Who is the incumbent that has been in office since before 1996 and was again re-elected?
SQL: SELECT "incumbent" FROM "iowa" WHERE "results"='re-elected' AND "first_elected"<1996;

Question: From which party is the incumbent who was first elected to office in 1990?
SQL: SELECT "party" FROM "iowa" WHERE "first_elected"=1990;

Question: In what year did the Democratic incumbent that was re-elected first take office?
SQL: SELECT "first_elected" FROM "iowa" WHERE "results"='re-elected' AND "party"='democratic';