ครีเอตินีนราคาเท่าไหร่?ไม่จำเป็นต้องใช้ทุกโต๊ะ
whats the cost for creatinine?It is not neccessary to use all the tables.
 medication:  medicationid [ number]  patientunitstayid [ number]  drugname [ text]  dosage [ text]  routeadmin [ text]  drugstarttime [ time]  drugstoptime [ time] 
SELECT DISTINCT cost.cost FROM cost WHERE cost.eventtype = 'lab' AND cost.eventid IN (SELECT lab.labid FROM lab WHERE lab.labname = 'creatinine')