instruction: how many days have passed since patient 7112 received his first 5% dextrose prescription in the in this hospital visit?
response: SELECT 1 * (STRFTIME('%j', CURRENT_TIME()) - STRFTIME('%j', prescriptions.startdate)) FROM prescriptions WHERE prescriptions.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 7112 AND admissions.dischtime IS NULL) AND prescriptions.drug = '5% dextrose' ORDER BY prescriptions.startdate LIMIT 1