นับจำนวนการมารักษาในโรงพยาบาลที่คนไข้ 48709 มีมาตั้งแต่ปี 2105 ไม่จำเป็นต้องใช้ตารางทั้งหมด
count the number of hospital visits that patient 48709 had since 2105.It is not neccessary to use all the tables.
 icustays:  row_id [ number]  subject_id [ number]  hadm_id [ number]  icustay_id [ number]  first_careunit [ text]  last_careunit [ text]  first_wardid [ number]  last_wardid [ number]  intime [ time]  outtime [ time] 
SELECT COUNT(DISTINCT admissions.hadm_id) FROM admissions WHERE admissions.subject_id = 48709 AND STRFTIME('%y', admissions.admittime) >= '2105'