Question

I’m moving DB from MySQL (used ODBC) to MS SQL and I want to ‘translate’ SQL queries to LINQ. Can someone help me with this (it should SUM Charge column for every location and group result by months):

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  

?

Output should look like this:

Location1 | Location2 | Location3 | date 

EDIT:

I tryed to use LINQ sample from here:

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(); 

and it is almost what I need. There should be grouping by year too and I don’t know how to do this.

Answer 1

This might help.

context.log_sales .GroupBy(s => new {Year = OrderTime.Year, Month = OrderTime.Month}) .Select ( g => new {   Date = new DateTime(g.Key.Year, g.Key.Month, 1),   Location1 = g.Where(s => s.Location == 'Location1').Sum(s => s.Charge),   Location2 = g.Where(s => s.Location == 'Location2').Sum(s => s.Charge),   Location3 = g.Where(s => s.Location == 'Location3').Sum(s => s.Charge),   } ) .OrderBy(x => x.Date);