以sql方式：

select *,
(
sum(count)  over (partition by 1 order by count desc) /*<---this line for return running totals*/
/(sum(count) over (partition by 1) /3) /*<-- divided total count into 3 group. In your case this is 9 for each zone value.*/
) /*<--using running totals divided by zone value*/
+ /*<-- 11 / 9 = 1 ... 2  You must plus 1 with quotient to let 11 in the right zone.Thus,I use this + operator  */
(
case when 
(
sum(count)  over (partition by 1 order by count desc)
%(sum(count) over (partition by 1) /3) /*<--calculate remainder */
) >1 then 1 else 0 end /*<--if remainder>1 then the zone must +1*/
)  as zone
from yourtable