雙連接查詢返回多個相同的記錄而不是唯一的記錄

Question

我試圖讓一個人屬於使用此查詢的團隊。問題在於它返回了人員所在團隊的所有部門的團隊（我得到了多個相同的記錄）。我想我必須替換.contains，但我無法弄清楚，因爲我是一個完整的newb，並且找不到任何有用的雙連接示例。爲了使其按預期工作，我必須改變什麼？提前致謝。

public IQueryable<Team> GetTeamsByPersonID(int id) 
    { 
     return from t in entities.Teams 
       join d in entities.Departments 
       on t.TeamID equals d.TeamID 
       where (from p in entities.Person_Departments 
         join dep in entities.Departments 
         on p.DepartmentID equals dep.DepartmentID 
         where p.PersonID == id 
         select dep.TeamID).Contains(d.TeamID) 
       select t; 
    } 

Answer 1

嘗試

return (
from t in entities.Teams 
from d in entities.Departments 
from p in entities.Person_Departments 
where t.TeamID == d.TeamID && p.DepartmentID == d.DepartmentID && p.PersonID == id 
select t 
).Distinct();