Roll up Fields

Hello Everyone,

I went through the below link to understand the difference between using Hierarchy set to "yes" and "No" in the source entity.

I tried the same practical from the below link but not getting the difference.

Please help me to understand the difference and the impact of results in both the cases.

https://technet.microsoft.com/en-us/library/dn832162.aspx

1)This Example working fine and showing me all the open revenue from the related opportunities of particular account.

Aggregate data for a record from related records

In this example, a hierarchy is not used. The total estimated revenue is calculated for an account, from the related open opportunities.

2)I tried the below one but again getting the same results in the rollup field as above

Aggregate data for a record from the related records, over the hierarchy

In this example, we calculate the total estimated revenue of open opportunities across all accounts, over the hierarchy.