what's the total amount of output patient 8116 had today?
select sum(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 8116 ) ) and datetime(outputevents.charttime,'start of day') = datetime(current_time,'start of day','-0 day')