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What is the difference between a JOIN and a RELATIONSHIP in hook_views_data_alter()

What is the difference between these two as implemented on hook_views_data_alter()? Why choose one over the other?

I did notice that in setting up a relationship between mytable1 and users tables, the Views UI gave me the option to add the mytable1.uid field under the relationship section, that way allows me to add users fields into the query.

What am I supposed to notice on the views-UI when I implement a join on a table? My implementation is as follows: 

mymodule_views_data_alter(&$data){      $data['mytable1']['table']['join']['users'] = array(         'left_field' => 'uid',         'field' => 'uid',     );  }

I did this without a relationship setting, so I can observe the exclusive effect of each(join vs relationship)

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What is the difference between a JOIN and a RELATIONSHIP in hook_views_data_alter()

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