ขั้นตอนอะไรบ้างที่สี่อันดับแรกได้รับมากที่สุดในปีที่แล้ว?ไม่จำเป็นต้องใช้ตารางทั้งหมด
what are the procedures that are the top four most commonly received during the last year?It is not neccessary to use all the tables.
 d_icd_procedures:  row_id [ number]  icd9_code [ text]  short_title [ text]  long_title [ text] 
SELECT d_icd_procedures.short_title FROM d_icd_procedures WHERE d_icd_procedures.icd9_code IN (SELECT t1.icd9_code FROM (SELECT procedures_icd.icd9_code, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM procedures_icd WHERE DATETIME(procedures_icd.charttime, 'start of year') = DATETIME(CURRENT_TIME(), 'start of year', '-1 year') GROUP BY procedures_icd.icd9_code) AS t1 WHERE t1.c1 <= 4)