อายุสูงสุดของผู้ป่วยที่มีสถานภาพสมรสแล้วและอายุมากกว่าหรือเท่ากับ 45 คือเท่าใด ไม่จำเป็นต้องใช้ตารางทั้งหมด
what is maximum age of patients whose marital status is married and age is greater than or equal to 45?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 MAX(demographic.age) FROM demographic WHERE demographic.marital_status = "MARRIED" AND demographic.age >= "45"