CREATE TABLE "former_mainline_highways" (
  "south_or_west_terminus" text,
  "north_or_east_terminus" text,
  "first_year" real,
  "final_year" real,
  "notes" text
);

Question: What is the most minimal Final year that has a North or east end of covington?
SQL: SELECT MIN("final_year") FROM "former_mainline_highways" WHERE "north_or_east_terminus"='covington';

Question: What is the total of Final year that has a Notes of replaced by i-96?
SQL: SELECT SUM("final_year") FROM "former_mainline_highways" WHERE "notes"='replaced by i-96';

Question: What is the most minimal Final year that has a Notes of replaced by i-75 and m-25, and a First year larger than 1926?
SQL: SELECT MIN("final_year") FROM "former_mainline_highways" WHERE "notes"='replaced by i-75 and m-25' AND "first_year">1926;

Question: What is the average First year that has a Notes of replaced by us 12 when i-94 replaced us 12, and a Final year larger than 1961?
SQL: SELECT AVG("first_year") FROM "former_mainline_highways" WHERE "notes"='replaced by us 12 when i-94 replaced us 12' AND "final_year">1961;