Linq组由多个表和内连接组成

Question

我有SQL查询,我想用linq重写它.这个sql命令只加入两个表并对它们进行分组.问题在于分组.当我在一个表上使用group by时,一切正常,linq commant返回与sql命令相同的结果.但是当我想加入两个表然后由H.Ucet分组(例如)然后它返回其他结果作为我的sql命令.结果与使用左连接时相同,但我想要默认的内连接.

这是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";

我尝试用这个linq命令重写它.

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)
                    });

谁能帮我 ？我看不出错误.

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)  
                };