ระบุจำนวนผู้ป่วยที่มีรหัสการวินิจฉัย icd9 คือ v1272 และของเหลวทดสอบในห้องปฏิบัติการเป็นน้ำในช่องท้อง ไม่จำเป็นต้องใช้ตารางทั้งหมด
provide the number of patients whose diagnosis icd9 code is v1272 and lab test fluid is ascites.It is not neccessary to use all the tables.
 demographic:  subject_id [ text]  hadm_id [ text]  name [ text]  marital_status [ text]  age [ text]  dob [ text]  gender [ text]  language [ text]  religion [ text]  admission_type [ text]  days_stay [ text]  insurance [ text]  ethnicity [ text]  expire_flag [ text]  admission_location [ text]  discharge_location [ text]  diagnosis [ text]  dod [ text]  dob_year [ text]  dod_year [ text]  admittime [ text]  dischtime [ text]  admityear [ text] 
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 = "V1272" AND lab.fluid = "Ascites"