[英]left join with group by and sum in linq to sql
I am trying to convert T-sql which is 我正在尝试转换T-sql
select c.description, sum(t.quantity), sum(t.Price) from trn_itm t
left join CAFE c on t.Item_key = c.dfm_key
where transaction_key = 87378
group by c.Description
my linq is 我的linq是
var query = from p in DfmSession.CurrentContext.TRN_ITMs
join c in DfmSession.CurrentContext.CAFEs on p.Item_key equals c.Dfm_key into t
from rt in t.DefaultIfEmpty()
where p.Transaction_key == _dfmkey
select new
{
Dfm_key = (int?)rt.Dfm_key,
rt.Description,
p.Quantity,
p.Price
};
How do I get Sum(p.Quantity) and Sum(p.Price)? 我如何得到Sum(p.Quantity)和Sum(p.Price)?
var query = from p in DfmSession.CurrentContext.TRN_ITMs
join c in DfmSession.CurrentContext.CAFEs on p.Item_key equals c.Dfm_key into t
from rt in t.DefaultIfEmpty()
where p.Transaction_key == _dfmkey
group p by rt.Description into g
select new
{
Description = g.Keu
Quantity = g.Select(x => x.Quantity).Sum()
Price = g.Select(x => x.Price).Sum()
};
var query = from p in DfmSession.CurrentContext.TRN_ITMs
join c in DfmSession.CurrentContext.CAFEs on p.Item_key equals c.Dfm_key into t
from rt in t.DefaultIfEmpty()
where p.Transaction_key == _dfmkey
group by rt.Description into g
select new
{
description = g.Key,
Price = g.Sum(x => x.Price),
Quantity = g.Sum(x => x.Quantity)
};
group by rt.Description into g
然后在g
上使用您选择的聚合函数,例如:
select new { Price = g.Sum(x => x.Price) }
group by su.Description into h
然后在h上使用您选择的聚合方法,例如:
select new { Price = h.Sum(y =? y.Price) }
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