Name                                                      Size  
 Parent Directory                                            -   
 1. Expressing a Parent-Child Relationship.mp4              69M  
 5. Which rows are leaf, branch, or root nodes.mp4          67M  
 2. Expressing a Child-Parent-Grandparent Relationship.mp4  53M  
 3. Creating a hierarchical view of a table.mp4             48M  
 4. Finding all child rows for a given parent row.mp4       20M