ปีนี้มีจำนวนผู้ป่วยกี่คนที่เข้าพักในหน่วยดูแล sicu?ไม่จำเป็นต้องใช้ตารางทั้งหมด
how many patients this year were staying in the careunit sicu?It is not neccessary to use all the tables.
 prescriptions:  row_id [ number]  subject_id [ number]  hadm_id [ number]  startdate [ time]  enddate [ time]  drug [ text]  dose_val_rx [ text]  dose_unit_rx [ text]  route [ text] 
SELECT COUNT(DISTINCT admissions.subject_id) FROM admissions WHERE admissions.hadm_id IN (SELECT transfers.hadm_id FROM transfers WHERE transfers.careunit = 'sicu' AND DATETIME(transfers.intime, 'start of year') = DATETIME(CURRENT_TIME(), 'start of year', '-0 year'))