What is the lowest Euro for a ticket with a price per valid day of & 34?
CREATE TABLE "durations_and_prices" (
  "valid" text,
  "within" text,
  "price_in_euro" real,
  "price_per_valid_day" text,
  "price_per_within_day" text,
  "area" text
);
SELECT MIN("price_in_euro") FROM "durations_and_prices" WHERE "price_per_valid_day"='& 34';