UseDatabaseNullSemantics still generating NULL checks

Question

I have this on my context object (constructor):

this.Configuration.UseDatabaseNullSemantics = true;

But even with this set, this query:

Answer 1

The condition you see inside the generated SQL has nothing in common with UseDatabaseNullSemantics and is needed to handle correctly LEFT LOINs with nullable keys.

I think the problem you are experiencing is caused by a logical error in your query. IMO, the join condition

on o.linkedorderid equals o2.linkedorderid

should be

on o.linkedorderid equals o2.orderid

because normally the FK relates (joins) to the PK.