How to define relationships for views module in drupal

How to define relationships for views module in drupal

References

Reference NO 1

https://drupal.org/node/812742

Reference NO 2

http://stackoverflow.com/questions/13642626/how-to-define-relationships-for-views-module-in-drupal-so-we-can-load-fields-of

Reference NO 3

http://drupal.stackexchange.com/questions/4100/views-3-relationship-handler

Reference NO 4

http://gotdrupal.com/videos/drupal-views-relationships

Reference NO 5

http://drupalcontrib.org/api/drupal/contributions!views!views.api.php/function/hook_views_data/7

Reference NO 6

http://www.trellon.com/content/blog/view-views-api

Reference NO 7

http://www.codeenigma.com/en/blog/node-references-and-relationships

Reference NO 8

http://drupaleasy.com/blogs/ultimike/2009/07/using-views-relationships-arguments-attachments