我正在将DB从MySQL(使用ODBC)移动到MS SQL,我想将“SQL查询”转换为LINQ。有人可以帮我解决这个问题(它应该为每个位置和组的结果按月收费):对LINQ的SQL命令(pivoting)
SELECT
sum(case when Location="Location1" then Charge else 0 end) as Location1,
sum(case when Location="Location2" then Charge else 0 end) as Location2,
sum(case when Location="Location3" then Charge else 0 end) as Location3,
MAKEDATE(YEAR(OrderTime),DAYOFYEAR(OrderTime)) AS date FROM Sales
GROUP BY YEAR(OrderTime),MONTH(OrderTime)
ORDER BY OrderTime DESC
?
输出应该是这样的:
Location1 | Location2 | Location3 | date
编辑:
我tryed从这里使用LINQ示例:
Is it possible to Pivot data using LINQ?
var query = context.log_sales
.GroupBy(c => c.OrderTime)
.Select(g => new
{
Date = g.Key,
Location1 = g.Where(c => c.Location == "Location1").Sum(c => c.Charge) ?? 0,
Location2 = g.Where(c => c.Location == "Location2").Sum(c => c.Charge) ?? 0
}).ToList();
,它几乎是我需要。也应该按年分组,我不知道如何做到这一点。
对答案的工作......只是想提到SQL中的ORDER BY无效。 OrderTime被分组了,不能在那里使用。 – 2008-10-08 18:00:26