How can I achieve SQL Pivot statement from LINQ - sql

Question

I am looking to achieve below SQL statement from LINQ. I am not sure whether is it possible? Can someone advice me on this?
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
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. Ie. 09/04 , 09/11, 09/18 etc. I did lot of research but i found only to group by Week Number.
This is as far as i could come up with LINQ which will return me the below result set.
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
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. Please can someone help me with this?

Answer 1

Well as a work-around i have used the Entity Framework Core's "FromSQL" method to execute my stored procedure which take cares of all the GROUP BY's.

Answer 2

you can use this.
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();