What is the least apparent magnitude for all constellations from hydra?
CREATE TABLE "3601_3700" (
  "ngc_number" real,
  "object_type" text,
  "constellation" text,
  "right_ascension_j2000" text,
  "declination_j2000" text,
  "apparent_magnitude" real
);
SELECT MIN("apparent_magnitude") FROM "3601_3700" WHERE "constellation"='hydra';