เป็นครั้งแรกที่ผู้ป่วย 23858 ได้รับขั้นตอนอะไรเมื่อ 2 ปีที่แล้ว?ไม่จำเป็นต้องใช้ตารางทั้งหมด
for the first time, what procedure did since 2 years ago patient 23858 receive?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 d_icd_procedures.short_title FROM d_icd_procedures WHERE d_icd_procedures.icd9_code IN (SELECT procedures_icd.icd9_code FROM procedures_icd WHERE procedures_icd.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 23858) AND DATETIME(procedures_icd.charttime) >= DATETIME(CURRENT_TIME(), '-2 year') ORDER BY procedures_icd.charttime LIMIT 1)