instruction: was the red blood cells value of patient 52647 measured at 2103-05-22 06:40:00 greater than the value measured at 2103-05-20 06:55:00?
response: SELECT (SELECT labevents.valuenum FROM labevents WHERE labevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 52647) AND labevents.itemid IN (SELECT d_labitems.itemid FROM d_labitems WHERE d_labitems.label = 'red blood cells') AND labevents.charttime = '2103-05-22 06:40:00') > (SELECT labevents.valuenum FROM labevents WHERE labevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 52647) AND labevents.itemid IN (SELECT d_labitems.itemid FROM d_labitems WHERE d_labitems.label = 'red blood cells') AND labevents.charttime = '2103-05-20 06:55:00')