ORACLE SQL Running TOTAL and daytotal using window function

Question

From the EMPLOYEE table, I want to group the amount of records(employees hired) AND also have the running TOTAL per day. The format of the input is like this:

row         


        

Answer 1

select trunc(hired), 
       count(*) hired_today,       
       sum(count(*)) over (order by trunc(hired)) as running_total
from emp
group by trunc(hired)

http://sqlfiddle.com/#!4/4bd36/9