ผู้ป่วย 009-4569 มี hgb ขั้นต่ำจนถึง 16 เดือนที่แล้วล่าสุดเมื่อใด? ไม่จำเป็นต้องใช้ตารางทั้งหมด
when did patient 009-4569 last have minimum hgb until 16 months ago?It is not neccessary to use all the tables.
 cost:  costid [ number]  uniquepid [ text]  patienthealthsystemstayid [ number]  eventtype [ text]  eventid [ number]  chargetime [ time]  cost [ number] 
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 = '009-4569')) AND lab.labname = 'hgb' AND DATETIME(lab.labresulttime) <= DATETIME(CURRENT_TIME(), '-16 month') ORDER BY lab.labresult, lab.labresulttime DESC LIMIT 1