从linq中的联接表中选择列的平均值
我有以下SQL代码:从linq中的联接表中选择列的平均值,linq,join,average,Linq,Join,Average,我有以下SQL代码: select AVG(passing.Duration), passing.pId, p.name, zn.title from passing inner join zn on passing.zId = zn.zId inner join p on passing.pId = p.pId group by passing.pId, zn.title, p.name 我想用linq格式写,我写的如下,但我不知道如何使用avergae函数来传递。Durat
select AVG(passing.Duration), passing.pId, p.name, zn.title
from passing inner join zn on passing.zId = zn.zId
inner join p on passing.pId = p.pId
group by passing.pId, zn.title, p.name
我想用linq格式写,我写的如下,但我不知道如何使用avergae函数来传递。Duration,它不存在p.Duration的平均函数
var pass = from p in db.passings
join z in db.zns on p.zId equals z.zId
join pr in db.ps on p.pId equals pr.pId
select new {p.Duration, p.pId, pr.name, z.title};
试试这个:
var pass = from p in db.passings
join z in db.zns on p.zId equals z.zId
join pr in db.ps on p.pId equals pr.pId
select new {p.Duration, p.pId, pr.name, z.title} into temp
from t in temp
group t by new{t.pId, t.name, t.title} into gr
select new{gr.Key.pId,
gr.Key.name,
gr.Key.title,
duration = gr.Average(c=>c.Duration)};
试试这个:
var pass = from p in db.passings
join z in db.zns on p.zId equals z.zId
join pr in db.ps on p.pId equals pr.pId
select new {p.Duration, p.pId, pr.name, z.title} into temp
from t in temp
group t by new{t.pId, t.name, t.title} into gr
select new{gr.Key.pId,
gr.Key.name,
gr.Key.title,
duration = gr.Average(c=>c.Duration)};
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