ผู้ป่วย 70234 ได้รับการตรวจเพาะเชื้อทางจุลชีววิทยาในเลือดครั้งแรกเมื่อใดนับตั้งแต่ 02/2105?ไม่จำเป็นต้องใช้ตารางทั้งหมด
when did patient 70234 receive the first microbiological blood culture test since 02/2105?It is not neccessary to use all the tables.
 icustays:  row_id [ number]  subject_id [ number]  hadm_id [ number]  icustay_id [ number]  first_careunit [ text]  last_careunit [ text]  first_wardid [ number]  last_wardid [ number]  intime [ time]  outtime [ time] 
SELECT microbiologyevents.charttime FROM microbiologyevents WHERE microbiologyevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 70234) AND microbiologyevents.spec_type_desc = 'blood culture' AND STRFTIME('%y-%m', microbiologyevents.charttime) >= '2105-02' ORDER BY microbiologyevents.charttime LIMIT 1