อะไรคือใบสั่งยาที่พบบ่อยที่สุดสี่อันดับแรกที่ผู้ป่วยได้รับยาภายใน 2 เดือนหลังจากได้รับยา valacyclovir ในปี 2105? ไม่จำเป็นต้องใช้ตารางทั้งหมด
what are the top four most frequent prescriptions that patient were prescribed with within 2 months after being prescribed with valacyclovir in 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 t3.drug FROM (SELECT t2.drug, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM (SELECT admissions.subject_id, prescriptions.startdate FROM prescriptions JOIN admissions ON prescriptions.hadm_id = admissions.hadm_id WHERE prescriptions.drug = 'valacyclovir' AND STRFTIME('%y', prescriptions.startdate) = '2105') AS t1 JOIN (SELECT admissions.subject_id, prescriptions.drug, prescriptions.startdate FROM prescriptions JOIN admissions ON prescriptions.hadm_id = admissions.hadm_id WHERE STRFTIME('%y', prescriptions.startdate) = '2105') AS t2 ON t1.subject_id = t2.subject_id WHERE t1.startdate < t2.startdate AND DATETIME(t2.startdate) BETWEEN DATETIME(t1.startdate) AND DATETIME(t1.startdate, '+2 month') GROUP BY t2.drug) AS t3 WHERE t3.c1 <= 4