誰かがSQLクエリをLINQ式に変換できますか？

Question

次のSQLクエリをLINQ式に変換できますか？

select student.StudentID, 
     student.FirstName + ' ' + student.MiddleInitial + ' ' + student.LastName, 
     student.OpenDate,  
     acct.Balance  
from Student student 
inner join 
(Select StudentID, Sum(Amount) as Balance 
from Account 
Group by StudentID) as acct on student.StudentID = acct.StudentID 

---

次LINQの式が働く

！本当にありがとうPhil !!!

var results = (from s in Students  
      join a in Accounts on s.StudentID equals a.StudentID  
      group a by new     
      {s.StudentID, s.FirstName, s.MiddleInitial, s.LastName, s.OpenDate}    
      into z  
      select new  
      { StudentID = z.Key.StudentID,   
       FirstName = z.Key.FirstName, 
       MiddleInitial = z.Key.MiddleInitial, 
       LastName = z.Key.LastName,   
       OpenDate = z.Key.OpenDate,   
       Balance = z.Sum(a=> a.Amount)  
      } 
      ); 

ありがとうございます！

Answer 1

これを試してください。

var stu = 
    from s in db.Students 
    join a in db.Account on s.StudentID equals a.StudentID 
    group a by new 
       {s.StudentID, s.FirstName, s.MiddleInitial, s.LastName, s.OpenDate} 
      into z 
    select new 
    { StudentID = z.Key.StudentID, 
     FullName = string.Format("{0} {1} {2}",z.Key.FirstName, z.Key.MiddleInitial, z.Key.LastName), 
     OpenDate = z.Key.OpenDate, 
     Balance = z.Sum(a=>a.Amount) 
    };