has patient 57023 been prescribed calcium gluconate in a month before.
select count(*)>0 from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 57023 ) and prescriptions.drug = 'calcium gluconate' and datetime(prescriptions.startdate,'start of month') = datetime(current_time,'start of month','-1 month')