instruction: oh what is the average value of -basos on patient 004-79017 since 6 months ago?
response: SELECT AVG(lab.labresult) FROM lab WHERE lab.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '004-79017')) AND lab.labname = '-basos' AND DATETIME(lab.labresulttime) >= DATETIME(CURRENT_TIME(), '-6 month')