[英]Replacing SQL join and group query with linq query in Entity Framework
我有一個現有的SQL查詢:
select
mn.accountid, sum(u.peak), sum(u.text), sum(u.datagig),
sum(p.minutesallowed), sum(p.messagesallowed), sum(p.dataallowed)
from
usage u
inner join
mtn mn on u.mtnid = mn.Id
inner join
[plan] p on p.id = mn.planid
group by
mn.accountid
使用實體框架,我正在將其轉換為linq,到目前為止,我已經做到了:
var tots = from u in currentUsage
join mn in mtns on u.mtnId equals mn.Id
join p in plans on mn.PlanId equals p.Id
group u by u.AccountId into g
select new MainUsageResults
{
TotalPeakMinutes = g.Sum(x => x.Peak),
TotalData = g.Sum(x => x.DataGig),
TotalMessaging = g.Sum(x => x.Text),
TotalAllowedMinutes = g.Sum(x => ???) ,
TotalAllowedMessages = g.Sum(x => ???) ,
TotalAllowedData = g.Sum(x => ???)
};
我不知道如何總結聯接表上的數據。 在SQL中,連接中可以使用整個列集,但在這里似乎並非如此。 在此示例中,如何獲取聯接表上的列總和?
感謝@ 3-14159265358979323846264,可以在這里找到一個很好的例子
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