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Return the Set Difference Between Two Sequences

Use the Except operator to return the set difference between two sequences.

This example uses Except to return a sequence of all countries in which Customers live but in which no Employees live.

var infoQuery =
    (from cust in db.Customers
    select cust.Country)
    .Except
        (from emp in db.Employees
        select emp.Country)
;

In LINQ to SQL, the Except operation is well defined only on sets. The semantics for multisets is undefined.

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