It is currently not possible to perform left outer join using Advanced Find, even though that capability exists in CRM2015. For e.g. if you want to get a list of contacts, that don’t have an invoice, you cannot do it using an ad-hoc Advanced Find.
This limitation is usually overcome by creating a system view that does a regular inner join, and then updating the view’s fetchxml using a tool like FXB or even editing the customisation file directly. There is also the rollup field approach described in http://crmtipoftheday.com/2015/04/27/not-in-for-the-rest-of-us/. But if you are going to do an ad-hoc advanced find query, you really don’t want to create one system view for each entity, for which you want to do an outer join.
I present to you a solution for this problem: AdvancedQueryOuterJoin
This is a plugin that runs on the pre-stage of RetrieveMultiple, and alters the fetchxml with the…
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Sreeni Pavalla's Blog 