นับจำนวนครั้งที่ในปี 02/ปีนี้ ผู้ป่วย 20,000 คนได้ให้อาหารทางสายยาง ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
count the number of times that in 02/this year patient 20000 had taken tube feeding.It is not neccessary to use all the tables.
 d_labitems:  row_id [ number]  itemid [ number]  label [ text] 
SELECT COUNT(*) FROM inputevents_cv WHERE inputevents_cv.icustay_id IN (SELECT icustays.icustay_id FROM icustays WHERE icustays.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 20000)) AND inputevents_cv.itemid IN (SELECT d_items.itemid FROM d_items WHERE d_items.label = 'tube feeding' AND d_items.linksto = 'inputevents_cv') AND DATETIME(inputevents_cv.charttime, 'start of year') = DATETIME(CURRENT_TIME(), 'start of year', '-0 year') AND STRFTIME('%m', inputevents_cv.charttime) = '02'