CREATE TABLE "banknotes" (
  "value" text,
  "color" text,
  "obverse" text,
  "reverse" text,
  "first_issued" real
);

Question: When was Color of green first issued?
SQL: SELECT MIN("first_issued") FROM "banknotes" WHERE "color"='green';

Question: When was Color of green last issued?
SQL: SELECT MAX("first_issued") FROM "banknotes" WHERE "color"='green';

Question: What reverse has a color of green?
SQL: SELECT "reverse" FROM "banknotes" WHERE "color"='green';

Question: How much was a Reverse of guitar of agustín pío barrios before 1998?
SQL: SELECT "value" FROM "banknotes" WHERE "first_issued"<1998 AND "reverse"='guitar of agustín pío barrios';