tell me patient 20801's minimum potassium, whole blood value in 10/2102?
select min(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 20801 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'potassium, whole blood' ) and strftime('%y-%m',labevents.charttime) = '2102-10'