ยาสี่ชนิดที่ต้องสั่งจ่ายบ่อยที่สุดสำหรับผู้ป่วยที่ได้รับการสั่งยาเดกซาเมทาโซน sod ฟอสเฟตในเวลาเดียวกันคืออะไร? ไม่จำเป็นต้องใช้ตารางทั้งหมด
what were the four most frequently prescribed drugs for patients who had also been prescribed dexamethasone sod phosphate at the same time?It is not neccessary to use all the tables.
 d_items:  row_id [ number]  itemid [ number]  label [ text]  linksto [ text] 
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 = 'dexamethasone sod phosphate') AS t1 JOIN (SELECT admissions.subject_id, prescriptions.drug, prescriptions.startdate FROM prescriptions JOIN admissions ON prescriptions.hadm_id = admissions.hadm_id) AS t2 ON t1.subject_id = t2.subject_id WHERE DATETIME(t1.startdate) = DATETIME(t2.startdate) GROUP BY t2.drug) AS t3 WHERE t3.c1 <= 4