คนไข้รหัส 18112 พักรักษาตัวในโรงพยาบาลกี่วัน?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
For how many days did patient with id 18112 stay in the 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 demographic.days_stay FROM demographic WHERE demographic.subject_id = "18112"