I use Drupal 7. I have read dozens of questions that revolve around the need to incorporate relationships among tables in Views (even many where the person asking the question phrased it differently, and the person answering the question said "just use Relations in Views"). I have also read various books that nearly always use single tables in example of pulling data from databases. I rarely see any understandable explanation of the use of "relations" in views. What's the point of using a relational database if it is so difficult to use joins? Can anyone shed any light on this? I've read the explanation in Pro Drupal 7 Development, which is arcane at best.