[英]How can I achieve SQL Pivot statement from LINQ
I am looking to achieve below SQL statement from LINQ. 我希望从LINQ实现下面的SQL语句。 I am not sure whether is it possible?
我不确定是否可能? Can someone advice me on this?
有人可以给我建议吗?
SELECT *
FROM (
SELECT CONVERT(VARCHAR, (DATEADD(WEEK, DATEDIFF(WEEK, 0, S.SampleDrawn), 0)), 101) [Date], [Range] =
CASE
WHEN ProbBacteremia >= 0 AND ProbBacteremia < 0.50 THEN 'Low'
WHEN ProbBacteremia >= 0.50 AND ProbBacteremia < 0.75 THEN 'Med'
ELSE 'High'
END
FROM Result.Calculation C INNER JOIN Data.SampleSet S ON C.SampleSetID = S.ID WHERE S.SampleDrawn >= DATEADD(WEEK,-1,GETDATE())) o
PIVOT
(
COUNT(o.[Range])
FOR [Range] IN (
[Low], [Med], [High])
) pt
ORDER BY [Date]
Result of the above query will be as below 以上查询的结果如下
Date Low Med High 09/04/2017 370 174 175 09/11/2017 764 352 389 09/18/2017 759 384 360 09/25/2017 765 385 404 10/02/2017 115 48 56
Note that, above date has grouped by week. 请注意,以上日期已按周分组。 Ie.
就是 09/04 , 09/11, 09/18 etc. I did lot of research but i found only to group by Week Number.
09/04,09/11,09/18等。我做了很多研究,但发现只按周数分组。
This is as far as i could come up with LINQ which will return me the below result set. 这是我所能想到的LINQ,它将返回以下结果集。
data = (from a in context.Calculations
where a.SampleSet.SampleDrawn >= dtStart && (isDeptFilter || a.SampleSet.Department == location)
group a by new { Text = RangeProvider(a.ProbBacteremia * 100, riskCats), Date = a.SampleSet.SampleDrawn.Date } into groupedData
orderby groupedData.Key.Date ascending
select new { Value = groupedData.Count(), Text = groupedData.Key.Text, Date = groupedData.Key.Date.ToShortDateString() }).ToList();
public static string RangeProvider(int value)
{
if (value > 0 && value <= 25)
{ return "Low"; }
if (value > 25 && value <= 75)
{ return "Medium"; }
if (value > 75 && value <= 90)
{ return "High"; }
else
{ return "Very High"; }
}
Result dataset of the obver LINQ is 观察者LINQ的结果数据集为
Date Text Value 09/04/2017 Low 65 09/04/2017 Med 80 09/04/2017 High 40 09/05/2017 Low 30 10/05/2017 Med 50 10/05/2017 High 44
Hope this explains what I'm trying to achieve. 希望这能解释我要达到的目标。 Please can someone help me with this?
请有人可以帮我吗?
作为一种变通办法,我使用了Entity Framework Core的“ FromSQL ”方法来执行我的存储过程,该过程将处理所有GROUP BY。
you can use this. 你可以用这个
data = (from a in context.Calculations
where a.SampleSet.SampleDrawn >= dtStart && (isDeptFilter || a.SampleSet.Department == location)
group a by new { Text = RangeProvider(a.ProbBacteremia * 100, riskCats), Date = a.SampleSet.SampleDrawn.Date } into groupedData
orderby groupedData.Key.Date ascending
select new {
Date = groupedData.Key.Date.ToShortDateString() ,
Low = ( groupedData.Key.Text =="Low" )?groupedData.Count() : 0,
Medium = ( groupedData.Key.Text =="Medium" )?groupedData.Count() : 0,
High = ( groupedData.Key.Text =="High" )?groupedData.Count() : 0,
VeryHigh = ( groupedData.Key.Text =="Very High" )?groupedData.Count() : 0
}).ToList();
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