CREATE TABLE "supervisors" (
  "year" real,
  "1st_district" text,
  "2nd_district" text,
  "3rd_district" text,
  "4th_district" text,
  "5th_district" text
);

Question: Who was in the 4th district in 1924?
SQL: SELECT "4th_district" FROM "supervisors" WHERE "year"=1924;

Question: List all the years with Cecil M. Featherly in the 1st district and David L. Baker in the 2nd district?
SQL: SELECT "year" FROM "supervisors" WHERE "2nd_district"='David L. Baker' AND "1st_district"='Cecil M. Featherly';

Question: What is the last year that Howard A. Wassum was in the 5th district?
SQL: SELECT MAX("year") FROM "supervisors" WHERE "5th_district"='Howard A. Wassum';