ผู้ป่วย 22753 ไปโรงพยาบาลเมื่อ 3 ปีที่แล้วกี่ครั้งแล้ว?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
how many times since 3 years ago does patient 22753 visit the hospital?It is not neccessary to use all the tables.
 admissions:  row_id [ number]  subject_id [ number]  hadm_id [ number]  admittime [ time]  dischtime [ time]  admission_type [ text]  admission_location [ text]  discharge_location [ text]  insurance [ text]  language [ text]  marital_status [ text]  ethnicity [ text]  age [ number] 
SELECT COUNT(DISTINCT admissions.hadm_id) FROM admissions WHERE admissions.subject_id = 22753 AND DATETIME(admissions.admittime) >= DATETIME(CURRENT_TIME(), '-3 year')