ชื่อของขั้นตอนที่ให้กับผู้ป่วย 51200 สองครั้งต่อเดือนก่อนหน้านี้ชื่ออะไร?ไม่จำเป็นต้องใช้ตารางทั้งหมด
what was the name of the procedure that was given two times to patient 51200 a month before?It is not neccessary to use all the tables.
 chartevents:  row_id [ number]  subject_id [ number]  hadm_id [ number]  icustay_id [ number]  itemid [ number]  charttime [ time]  valuenum [ number]  valueuom [ 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, COUNT(procedures_icd.charttime) AS c1 FROM procedures_icd WHERE procedures_icd.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 51200) AND DATETIME(procedures_icd.charttime, 'start of month') = DATETIME(CURRENT_TIME(), 'start of month', '-1 month') GROUP BY procedures_icd.icd9_code) AS t1 WHERE t1.c1 = 2)