ขอทราบจำนวนผู้ป่วยที่เป็นโรคประจำตัวคือน้ำตาลในเลือดสูงและปีเกิดน้อยกว่า 2,168 ราย ไม่จำเป็นต้องใช้ตารางทั้งหมดครับ
give me the number of patients whose primary disease is hyperglycemia and year of birth is less than 2168?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 WHERE demographic.diagnosis = "HYPERGLYCEMIA" AND demographic.dob_year < "2168"