instruction: indicate the daily maximum amount of foley output that patient 68280 had had since 12/18/2105.
response: SELECT MAX(outputevents.value) FROM outputevents WHERE outputevents.icustay_id IN (SELECT icustays.icustay_id FROM icustays WHERE icustays.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 68280)) AND outputevents.itemid IN (SELECT d_items.itemid FROM d_items WHERE d_items.label = 'foley' AND d_items.linksto = 'outputevents') AND STRFTIME('%y-%m-%d', outputevents.charttime) >= '2105-12-18' GROUP BY STRFTIME('%y-%m-%d', outputevents.charttime)