มองหาจำนวนผู้ป่วยที่ออกจากโรงพยาบาลระยะสั้นได้ ไม่จำเป็นต้องใช้ทุกโต๊ะ
look for the number of patients who were discharged to short term hospital.It is not neccessary to use all the tables.
 prescriptions:  subject_id [ text]  hadm_id [ text]  icustay_id [ text]  drug_type [ text]  drug [ text]  formulary_drug_cd [ text]  route [ text]  drug_dose [ text] 
SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic WHERE demographic.discharge_location = "SHORT TERM HOSPITAL"