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now today weamp;#39;re going to look at cross apply and outer apply iamp;#39;ll explain how they differ from regular joints and why we need them apply why do we need it so to start things off letamp;#39;s take a look at a simple query the simple left join so as you can see weamp;#39;re just going to join the person table to get their name to the person phone table to get their phone number now weamp;#39;re going to use a left join as iamp;#39;m sure most of you are familiar with because maybe theyamp;#39;re someone that we have a customer that didnamp;#39;t provide their phone number all right so they may not have a record in this table but we still want to return the names of all our customers anyway so letamp;#39;s go ahead and run this weamp;#39;re just going to filter it to for the first 10 customers all right okay and as you can see most customers have a phone number except michael raheem he does not so he does not have a record in the person phone table