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select count([t0].id),avg([t0].Fsalary),[t0].年龄段 from
(
select id,
(
case
when (Fage<20) then '<20'
when (Fage>=20 and Fage<30)then '20 -30'
when (Fage>=30 and Fage<40)then '30 -40'
when (Fage>=40 )then '>40'
else 'error'
end
) AS '年龄段',
FAge ,
FName,
fsalary
from T_Employee
) as [t0]
group by [t0].年龄段
var q = (from a in list
group a by new { range = a.age < 20 ? "<20" : (a.age >= 20 && a.age <= 30 ? "20-30" : ">30") } into g
select new {
key = g.Key,
count = g.Count(),
salary = g.Average(b=>b.salary)
});
foreach (var item in q)
{
Response.Write(item.count+" "+item.salary+" "+item.key.range+" <br />");
}