Linq組由多個表和內連接組成

Question

我有SQL查詢，我想用linq重寫它。 這個sql命令只加入兩個表並對它們進行分組。 問題在於分組。 當我在一個表上使用group by時，一切正常，linq commant返回與sql命令相同的結果。 但是當我想加入兩個表然后由H.Ucet分組（例如）然后它返回其他結果作為我的sql命令。 結果與使用左連接時相同，但我想要默認的內連接。

這是sql命令：

string dotazBankUcty = @"SELECT 
 H.UCET, 
 SUM(H.MD) AS MD, 
 SUM(H.DAL) AS DAL , 
 SUM(H.MD_M) AS MD_M, 
 SUM(H.DAL_ENA) DAL_M, 
 MAX(UBUC.KOD) AS KOD 
 FROM ACCOUNT H 
 inner join UBU on H.UCET = UBU.UCET GROUP BY H.UCET";

我嘗試用這個linq命令重寫它。

var accountQuery = new XPQuery<ACCOUNT >(CoreHelper.DataSession);

var ubuQuery = new XPQuery<UBU>(CoreHelper.DataSession);

var resultBankyUcty = (from h in accountQuery 
    join u in ubuQuery on h.CompoundKey1.UCET equals u.UCET
    group new { h, u } by new { h.CompoundKey1.UCET } into gUcty
                    select new
                    {
                    Ucet = gUcty.Key.UCET,
                    MD = gUcty.Sum(k => k.h.MD),
                    DAL = gUcty.Sum(k => k.h.DAL),
                    MD_M = gUcty.Sum(k => k.h.MDM),
                    DAL_M = gUcty.Sum(k => k.h.DALM),
                    KOD = gUcty.Max(k => k.u.KOD)
                    });

誰能幫我 ？ 我看不出錯誤。

Answer 1

from t in (
           from h in accountquery
           join u in ubuQuery on h.CompoundKey1.UCET equals u.UCET
           select new {h,u}
           ) group t by new {t.h.CompoundKey1.UCET} into g 

            select new {
                    Ucet = g.Key.UCET,
                    MD = g.Sum(k => k.h.MD),
                    DAL = g.Sum(k => k.h.DAL),
                    MD_M = g.Sum(k => k.h.MDM),
                    DAL_M = g.Sum(k => k.h.DALM),
                    KOD = g.Max(k => k.u.KOD)  
                };