instruction: when was the last time patient 006-40255 was prescribed 37.5 g tube : glucose 40 % po gel and nss 0.9% 500 ml bolus infusion until 9 months ago at the same time?
response: SELECT t1.drugstarttime FROM (SELECT patient.uniquepid, medication.drugstarttime FROM medication JOIN patient ON medication.patientunitstayid = patient.patientunitstayid WHERE medication.drugname = '37.5 g tube : glucose 40 % po gel' AND patient.uniquepid = '006-40255' AND DATETIME(medication.drugstarttime) <= DATETIME(CURRENT_TIME(), '-9 month')) AS t1 JOIN (SELECT patient.uniquepid, medication.drugstarttime FROM medication JOIN patient ON medication.patientunitstayid = patient.patientunitstayid WHERE medication.drugname = 'nss 0.9% 500 ml bolus infusion' AND patient.uniquepid = '006-40255' AND DATETIME(medication.drugstarttime) <= DATETIME(CURRENT_TIME(), '-9 month')) AS t2 ON t1.uniquepid = t2.uniquepid WHERE DATETIME(t1.drugstarttime) = DATETIME(t2.drugstarttime) ORDER BY t1.drugstarttime DESC LIMIT 1