Question

我有一个SQL查询，用列值的总和提取排序数据。我有一个名为CustomerPoint的表，它有2列名为CusTomerID和Point，我想提取点数最高SUM的人。这是我的SQL查询，它运行正常。但我需要使用LambdaExpressions或Linq查询在EF6.3中执行它。

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

感谢您的帮助！

Answer 1

这样的事情：

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

请试一试。

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

lambda形式的多样性：

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

将MSSQL查询转换为Lambda表达式或LINQ。分组求和和排序

3 个答案: