SQL Server Non-Clustered Index structure details

The non-clustered index key structure would be as follows:

Case 1: If a table has a unique clustered index index and non-unique non-clusterd index index

then its root level will have non-clustered key + clustered key

And at leaf level, non-clustered key + clustered key

Case 2: If a table has a unique clustered index index and unique non-clusterd index index

then my root level will have non-clustered key

And at leaf level, non-clustered key + clustered key

Case 3: If a table has a non-unique clustered index index and non-unique non-clusterd index index

then its root level will have non-clustered key + clustered key + Uniquifier

And at leaf level, non-clustered key + clustered key + Uniquifier.

Case 4: If a table has non-unique clustered index index and unique non-clusterd index index

then its root level will have non-clustered key

And at leaf level, non-clustered key + clustered key +Uniquifier.

The below snapshot explains the same as above: