Merge Data Table Activity

Can anybody show me how to use the Merge Data Table activity?I tried to use it with 2 tables with common column as the key column.But still getting an error,

Message: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

I tried using T1,T2 as follows.
T1: ID,Name
T2: ID,Address

I also followed the following post.But also want to know how to use this particular activity to achieve merging.

The error you got occur due to - duplicate rows being returned with the same primary key.
Try with the new values …

Can you also explain the use of “AddWithKey” for Missing schema action?

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