count the number of times that patient 31325 had had an dextrose 10% intake until 4 months ago.
select count(*) 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 = 31325 ) ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = 'dextrose 10%' and d_items.linksto = 'inputevents_cv' ) and datetime(inputevents_cv.charttime) <= datetime(current_time,'-4 month')