SELECT
  prf.PF_CODE, prf.PF_NAME, round(100 * cast(hsp.INP_YES as real) / cast((hsp.INP_YES + hsp.INP_NO + hsp.UNIDENTIFIED) as real), 1)
FROM
  PREFECTURE prf
INNER JOIN
  HOSPITALIZATION hsp
ON
  prf.PF_CODE = hsp.PF_CODE