สำหรับผู้ป่วยที่ได้รับการวินิจฉัยว่าเป็น chr airway obstruct nec จนถึงปี 2104 อะไรคือยายอดนิยม 4 อันดับแรกที่ตามมาภายหลังในการไปโรงพยาบาลครั้งเดียวกันกับผู้ป่วยชายอายุ 40 ปี? ไม่จำเป็นต้องใช้ตารางทั้งหมด
for patients who were diagnosed with chr airway obstruct nec until 2104, what are the top four most commonly prescribed drugs that followed afterwards within the same hospital visit to the male patients aged 40s?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 t3.drug FROM (SELECT t2.drug, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM (SELECT admissions.subject_id, diagnoses_icd.charttime, admissions.hadm_id FROM diagnoses_icd JOIN admissions ON diagnoses_icd.hadm_id = admissions.hadm_id WHERE diagnoses_icd.icd9_code = (SELECT d_icd_diagnoses.icd9_code FROM d_icd_diagnoses WHERE d_icd_diagnoses.short_title = 'chr airway obstruct nec') AND STRFTIME('%y', diagnoses_icd.charttime) <= '2104') AS t1 JOIN (SELECT admissions.subject_id, prescriptions.drug, prescriptions.startdate, admissions.hadm_id FROM prescriptions JOIN admissions ON prescriptions.hadm_id = admissions.hadm_id WHERE admissions.subject_id IN (SELECT patients.subject_id FROM patients WHERE patients.gender = 'm') AND admissions.age BETWEEN 40 AND 49 AND STRFTIME('%y', prescriptions.startdate) <= '2104') AS t2 ON t1.subject_id = t2.subject_id WHERE t1.charttime < t2.startdate AND t1.hadm_id = t2.hadm_id GROUP BY t2.drug) AS t3 WHERE t3.c1 <= 4