c# - Independent Association does not retrieve all rows when no foreign key constraint exists in database -

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i using ef6.1 database first/objectcontext/pocos.

i have table called foo , table called foohistory. how model looks like:

enter image description here

due legacy reasons, foono primary key on foo, not on foohistory , foreign key constraint does not exist in database. however, logical foreign key, set 1 many independent association between foo , foohistory. principal/dependent property foono.

the following linq-to-entities query: 

        var qry = f in context.foo.include("history")                   f.foono.trim() == "someno"                   select f.history.count();

returns value of 6, whereas sql sent database returns 10 rows (which want).

i managed query give me full 10 rows creating foreign key constraint in database on foono , updating model. @ point ef referential constraint in association's properties changed name of database constraint. multiplicity changed, becoming 0...1 many.

however, i'd understand why first approach not work - why results different when in both cases query sent database same? going on internally?


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