ระบุจำนวนผู้ป่วยที่มีสถานภาพสมรสเป็นโสดและได้รับอะไมเลสแล้ว ตรวจน้ำในช่องท้องแล้ว ไม่จำเป็นต้องใช้ตารางทั้งหมด
provide the number of patients whose marital status is single and who have got amylase, ascites lab test done.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 lab ON demographic.hadm_id = lab.hadm_id WHERE demographic.marital_status = "SINGLE" AND lab.label = "Amylase, Ascites"