Changing an inner join to a left join in views 3.3?
I found clicking on the reduce duplicates checkbox converted my INNER JOINs to LEFT JOINs:



Before I was getting something akin to the following injected into my query:

INNER JOIN {field_data_field_random_field field_data_field_random_field} 
        ON node.nid = field_data_field_random_field.entity_id 
       AND (field_data_field_random_field.entity_type = 'node' 
       AND field_data_field_random_field.deleted = '0')


These inner joins were being caused by simple taxonomy filters, so sadly I didn't have any relationships to unrequire. Checking this box however doesn't seem to have altered my query in any other way, save for removing the inner joins, which is perfect for me; and may help someone else out there in this vast monkey adventure called life.