OLAP SQL - running count/total - response (1) by nealvenna

Below is the solution and answer is inspired from 

Dieter Answer  from the link below

https://forums.teradata.com/forum/database/olap-function-csum-sum-with-reset-value

select cal_date, 

  holiday_flag, 

 sum(holiday_flag) over(order by cal_date  RESET WHEN holiday_flag =  0 rows unbounded preceding )

as count_num from dim_date