instruction: what was the last time that patient 005-64055 had the minimum amount of oxyhemoglobin in 08/last year?
response: SELECT lab.labresulttime FROM lab WHERE lab.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '005-64055')) AND lab.labname = 'oxyhemoglobin' AND DATETIME(lab.labresulttime, 'start of year') = DATETIME(CURRENT_TIME(), 'start of year', '-1 year') AND STRFTIME('%m', lab.labresulttime) = '08' ORDER BY lab.labresult, lab.labresulttime DESC LIMIT 1