มีผู้ป่วยชื่อยา spironolactone กี่ราย?ไม่จำเป็นต้องใช้ทุกตาราง
how many patients whose drug name is spironolactone?It is not neccessary to use all the tables.
 procedures:  subject_id [ text]  hadm_id [ text]  icd9_code [ text]  short_title [ text]  long_title [ text] 
SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE prescriptions.drug = "Spironolactone"