when did patient 1114 get prescribed a drug via po/ng for the first time since 31 months ago?
select prescriptions.startdate from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 1114 ) and prescriptions.route = 'po/ng' and datetime(prescriptions.startdate) >= datetime(current_time,'-31 month') order by prescriptions.startdate asc limit 1