ตัวอย่างทดสอบทั่วไปสามตัวอย่างสำหรับผู้ป่วยที่ได้รับการถ่ายเซลล์แบบแพ็คก่อนหน้านี้ภายในเดือนเดียวกันจนถึง 2 ปีที่แล้วคืออะไร? ไม่จำเป็นที่จะต้องใช้ตารางทั้งหมด
what are the three commonly tested specimens for patients that received packed cell transfusion previously within the same month, until 2 years ago?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 t3.spec_type_desc FROM (SELECT t2.spec_type_desc, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM (SELECT admissions.subject_id, procedures_icd.charttime FROM procedures_icd JOIN admissions ON procedures_icd.hadm_id = admissions.hadm_id WHERE procedures_icd.icd9_code = (SELECT d_icd_procedures.icd9_code FROM d_icd_procedures WHERE d_icd_procedures.short_title = 'packed cell transfusion') AND DATETIME(procedures_icd.charttime) <= DATETIME(CURRENT_TIME(), '-2 year')) AS t1 JOIN (SELECT admissions.subject_id, microbiologyevents.spec_type_desc, microbiologyevents.charttime FROM microbiologyevents JOIN admissions ON microbiologyevents.hadm_id = admissions.hadm_id WHERE DATETIME(microbiologyevents.charttime) <= DATETIME(CURRENT_TIME(), '-2 year')) AS t2 ON t1.subject_id = t2.subject_id WHERE t1.charttime < t2.charttime AND DATETIME(t1.charttime, 'start of month') = DATETIME(t2.charttime, 'start of month') GROUP BY t2.spec_type_desc) AS t3 WHERE t3.c1 <= 3