What is the lowest pupil to teacher ratio for Saratoga schools with smaller than 1213 students?
CREATE TABLE "schools" (
  "school_name" text,
  "city" text,
  "students" real,
  "fte_teachers" real,
  "pupil_teacher_ratio" real
);
SELECT MIN("pupil_teacher_ratio") FROM "schools" WHERE "city"='saratoga' AND "students"<1213;