อายุ >= 20 ;ไม่จำเป็นต้องใช้ทุกตาราง
age >= 20 ;It is not neccessary to use all the tables.
 table_train_19:  "id" [ int]  "white_blood_cell_count_wbc" [ int]  "active_infection" [ bool]  "heart_disease" [ bool]  "temperature" [ float]  "skin_lesion" [ bool]  "heart_rate" [ int]  "paco2" [ float]  "immature_form" [ int]  "respiratory_rate" [ int]  "age" [ float]  "NOUSE" [ float] 
SELECT * FROM table_train_19 WHERE age >= 20