如何在LINQ中編寫「不在」SQL查詢？

Question

如何將以下SQL查詢轉換爲可比較的LINQ查詢？

select * from Dept 
where Id not in (
    Select Id 
    from Employee 
    where Salary > 100); 

Answer 1

嘗試這樣：

var result = from d in Dept 
      let expensiveEmployeeIds = (from e in Employee.Employees 
             where e.Salary > 100 
             select e.Id) 
      where !expensiveEmployeeIds.Contains(d.Id) 
      select d; 

Answer 2

這個怎麼樣？

var lowPaidEmps = from d in db.Dept 
        join e in db.Employees on d.Id equals e.Id 
        where e.Salary <= 100 
        select d;