instruction: when was the first time that patient 021-100763 had the urine output during the previous day?
response: SELECT intakeoutput.intakeoutputtime FROM intakeoutput WHERE intakeoutput.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '021-100763')) AND intakeoutput.cellpath LIKE '%output%' AND intakeoutput.celllabel = 'urine' AND DATETIME(intakeoutput.intakeoutputtime, 'start of day') = DATETIME(CURRENT_TIME(), 'start of day', '-1 day') ORDER BY intakeoutput.intakeoutputtime LIMIT 1