How to Use SQL Server HierarchyID Through Easy Examples

Do you still hold on to the parent/child design, or would like to try something new, like SQL Server hierarchyID? Well, it is really new because hierarchyID has been a part of SQL Server since 2008. Of course, the novelty itself is not a persuasive argument. But note that Microsoft added this feature to represent one-to-many relationships with multiple levels in a better way.