instruction: How many patients are diagnosed with noninf gastroenterit nec and received medication through oral drug route?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE diagnoses.short_title = "Noninf gastroenterit NEC" AND prescriptions.route = "ORAL"