instruction: how many patients whose diagnoses icd9 code is 9110 and lab test fluid is ascites?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN lab ON demographic.hadm_id = lab.hadm_id WHERE diagnoses.icd9_code = "9110" AND lab.fluid = "Ascites"