ผู้ป่วย 30826 ได้รับการทดสอบแคลเซียมฟรีในเดือนนี้หรือไม่ ไม่จำเป็นต้องใช้ตารางทั้งหมด
did patient 30826 receive any tests for free calcium in this month?It is not neccessary to use all the tables.
 d_icd_procedures:  row_id [ number]  icd9_code [ text]  short_title [ text]  long_title [ text] 
SELECT COUNT(*) > 0 FROM labevents WHERE labevents.itemid IN (SELECT d_labitems.itemid FROM d_labitems WHERE d_labitems.label = 'free calcium') AND labevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 30826) AND DATETIME(labevents.charttime, 'start of month') = DATETIME(CURRENT_TIME(), 'start of month', '-0 month')