ยาลดความดันโลหิต - beta blocker ราคาเท่าไหร่ไม่จำเป็นต้องใช้ตารางทั้งหมด
how much does antihypertensive drug - beta blocker cost.It is not neccessary to use all the tables.
 allergy:  allergyid [ number]  patientunitstayid [ number]  drugname [ text]  allergyname [ text]  allergytime [ time] 
SELECT DISTINCT cost.cost FROM cost WHERE cost.eventtype = 'treatment' AND cost.eventid IN (SELECT treatment.treatmentid FROM treatment WHERE treatment.treatmentname = 'antihypertensive drug - beta blocker')