SQL到L2S翻譯幫助

Question

因此，這裏是原始查詢

SELECT SUM（PickQty），SUM（ReqQty），AssignmentID，StopID FROM PickRequest GROUP BY AssignmentID，在LINQ

StopID

from a in dbReqs 
group a by new { a.AssignmentID, a.StopID } 
into pr 
select new 
{ 
Assignment = pr.Key, 
StopID = pr.Select(s=> s.StopID), 
PickQty = pr.Sum(p=> p.PickedQty), 
Count = pr.Sum(c => c.ReqQty) 
} 

我一定在做錯事，因爲LINQ版本需要很長時間，而且結果似乎有點偏離。想法？

Answer 1

嘗試：

from a in dbReqs 
group a by new { a.AssignmentID, a.StopID } 
into pr 
select new 
{ 
    AssignmentID = pr.Key.AssignmentID, 
    StopID = pr.Key.StopID, 
    PickQty = pr.Sum(p=> p.PickedQty), 
    Count = pr.Sum(c => c.ReqQty) 
} 

注意您可以監視什麼LINQ到SQL確實很容易：

ctx.Log = Console.Out; // or some other writer