將MSSQL查詢轉換爲Lambda表達式或LINQ。分組加總和排序

Question

我有一個SQL查詢提取排序數據的總和列值。我有一個名爲CustomerPoint的表格，它有兩列，名稱分別爲CusTomerID和Point，我想提取最高點SUM的人。這是我的SQL查詢，它運行正常。但我需要在EF6.3中使用LambdaExpressions或Linq查詢執行它。

SELECT SUM(Point) AS POINTS, CustomerID FROM CustomerPoint AS POINTS GROUP BY CustomerID ORDER BY POINTS 

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Answer 1

事情是這樣的：

from p in context.Points 
group p by p.CustomerID into gr 
select new { CustomerID = gr.Key, POINTS = gr.Sum(c=>c.Point) } into re 
orderby re.POINTS 

Answer 2

請試試這個。

from cp in db.CustomerPoints 
Group cp by cp.CusTomerID into cpg 
select new { CusTomerID = cpg.Key, Points = cpg.Sum(c => c.Point)} 
orderby cpg.Points 

Answer 3

而對於多樣性的λ形式：

var query = youContext.CustomerPoints 
      .GroupBy(x => x.CustomerID) 
      .Select(x => new { Points = x.Sum(y => y.Point), 
           CustomerID = x.Key }) 
      .OrderBy(x => x.Points);