ค่าแรกของอัตราการเต้นของหัวใจที่ผู้ป่วย 28443 มีในเดือน/29 นี้คือเท่าใด ไม่จำเป็นต้องใช้ตารางทั้งหมด
what was the first value of heart rate patient 28443 had on this month/29.It is not neccessary to use all the tables.
 labevents:  row_id [ number]  subject_id [ number]  hadm_id [ number]  itemid [ number]  charttime [ time]  valuenum [ number]  valueuom [ text] 
SELECT chartevents.valuenum FROM chartevents WHERE chartevents.icustay_id IN (SELECT icustays.icustay_id FROM icustays WHERE icustays.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 28443)) AND chartevents.itemid IN (SELECT d_items.itemid FROM d_items WHERE d_items.label = 'heart rate' AND d_items.linksto = 'chartevents') AND DATETIME(chartevents.charttime, 'start of month') = DATETIME(CURRENT_TIME(), 'start of month', '-0 month') AND STRFTIME('%d', chartevents.charttime) = '29' ORDER BY chartevents.charttime LIMIT 1