calculate the total sum for patient 25733's input today.
select sum(inputevents_cv.amount) from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 25733 ) ) and datetime(inputevents_cv.charttime,'start of day') = datetime(current_time,'start of day','-0 day')