[英]WHERE condition with SELECT, MAX statement using LINQ/Lambda
I am trying to convert below SQL query to LINQ/Lambda in C#我正在尝试将以下 SQL 查询转换为 C# 中的 LINQ/Lambda
SELECT DISTINCT M.InternalID, P.Code
FROM (
dbo.MeasureValue MV
INNER JOIN dbo.Measure M ON MV.MeasureID = M.ID
INNER JOIN dbo.Provider P ON MV.ProviderID = P.ID
)
WHERE MV.ReportingDate = (
SELECT MAX(ReportingDate)
FROM (
SELECT ReportingDate
FROM dbo.MeasureValue
WHERE MeasureID = MV.MeasureID
) MaxReportingDate
);
I have got so far,我到目前为止,
(from MV in MeasureValues
join M in Measures on MV.MeasureID equals M.ID
join P in Providers on MV.ProviderID equals P.ID
Where //???
select new //Distinct??
{ M.InternalID, P.Code} )
Could someone please guide me how to use nested WHERE condition as in SQL query and do MAX of nested SELECT and DISTINCT on whole?有人可以指导我如何在 SQL 查询中使用嵌套的 WHERE 条件,并在整体上执行嵌套 SELECT 和 DISTINCT 的 MAX 吗?
As a whole the LINQ/Lamda should output same result as SQL query.作为一个整体,LINQ/Lamda 应该输出与 SQL 查询相同的结果。
*I am new to SQL and LINQ *我是 SQL 和 LINQ 的新手
Thanks in advance.提前致谢。
Try this one:试试这个:
var query =
from mv in MeasureValues
join m in Measures on mv.MeasureID equals m.ID
join p in Providers on mv.ProviderID equals p.ID
where mv.ReportingDate ==
(from mv2 in MeasureValues
where mv2.MeasureID == mv.MeasureID
orderby mv2.ReportingDate descending
select mv2.ReportingDate
).FirstOrDefault()
select new { m.InternalID, p.Code };
var distinct =
from q in query
group q by new { q.InternalID, q.Code} into gr
select new
{
InternalID = gr.First().InternalID,
Code = gr.First().Code
};
var result = distinct.ToList();
Another option to find max ReportingDate
:查找 max
ReportingDate
另一种选择:
var query =
from mv in MeasureValues
join m in Measures on mv.MeasureID equals m.ID
join p in Providers on mv.ProviderID equals p.ID
where mv.ReportingDate == MeasureValues.Where(x => x.MeasureID == mv.MeasureID).Select(x => x.ReportingDate).Max()
select new { m.InternalID, p.Code };
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