TagId, sdata
8862, [0,0,0,0,2,2,2,3,4]
6304, [0,0,0,0,2,2,2,3,4]

TestTable
| where TagId in (8862,6304)
| make-series sdata = avg(todouble(Value)) default=0 on TimeStamp in range (datetime(2019-06-27), datetime(2019-06-29), 1m) by TagId
| as S1;
S1 | project ddata = series_divide(sdata[0].['sdata'], sdata[1].['sdata'])
| as S2