How to use multiple groupby in multiple joins and leftjoin in linq to sql ,

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Hi ,

I want to group by on multiple columns in linq.

Below is sql query I have I ant to generate similar type of group by in my linq

SQL

SELECT p.ProductID,p.Name, p.Code,st.Month,st.Year,st.StartDate,SUM(ISNULL(st.Qty,0)) 
	AS Qty, sum(ISNULL(st.Value,0)) AS Value
	FROM UserToProduct up
	INNER JOIN Product p ON up.ProductID = p.ProductID
	LEFT OUTER JOIN SalesTarget st ON p.ProductID = st.ProductID AND st.IsInActive = 0
	AND st.UserID = @UserID AND st.Year = @Year
	WHERE up.IsInActive = 0 AND p.IsInActive = 0 AND up.UserID = @UserID AND p.IsLiterature = 0
	GROUP BY p.ProductID,p.Name, p.Code,st.Month,st.Year,st.StartDate

What I have tried:

C#

var result = from up in db.UserToProducts.Where(up => up.IsInActive == false && up.UserID == userID)
                       join p in db.Products.Where(p => p.IsInActive == false && p.IsLiterature == false)
                       on up.ProductID equals p.ProductID
                       join s in db.Sales.Where(s => s.IsInActive == false && s.UserID == userID
                       && s.Date.Year == year && s.Date.Month == month)
                       on p.ProductID equals s.ProductID into joined
                       from j in joined.DefaultIfEmpty()
                       select new SalesachievementBO
                       {

                       };

Posted 3-Mar-16 0:47am

Torakami

Updated 3-Mar-16 10:33am

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CHill60 3-Mar-16 6:58am

And what went wrong with the code you tried?

Torakami 3-Mar-16 7:08am

I am not getting how to do group by in my query , i have created till the point except not sure how to use multiple group by on this type of query

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Torakami · Accepted Answer · 2016-03-03T10:33:00

C#

var result = from p in db.Products.Where(p => p.IsInActive == false && p.IsLiterature == false)
                         join up in db.UserToProducts.Where(up => up.IsInActive == false
                         && up.UserID == userID) on p.ProductID equals up.ProductID
                         join ul in db.UserToLocations.Where(ul => ul.IsInActive == false)
                         on up.UserID equals ul.UserID
                         join l in db.Locations.Where(l => l.IsInActive == false)
                         on ul.LocationID equals l.LocationID
                         join s in db.Sales.Where(s => s.IsInActive == false && s.UserID == userID && s.Date.Month == month
                         && s.Date.Year == year && s.WholeSalerID == wholeSalerId) on l.LocationID equals s.LocationID into joined
                         from merged in joined.DefaultIfEmpty()
                         group new { up.Product, ul.Location, merged }
                         by new
                         {
                             LocationID = ul.Location.LocationID,
                             ul.Location.Name,
                             ProductID = up.Product.ProductID,
                             ProdictName = up.Product.Name,
                             up.Product.Code,
                             month = merged.Date.Month,
                             year = merged.Date.Year,
                             merged.Date
                         } into g
                         select new SalesachievementBO()
                         {
                             ProductID = g.Key.ProductID,
                             ProductName = g.Key.ProdictName,
                             ProductCode = g.Key.Code,
                             LocationId = g.Key.LocationID,
                             LocationName = g.Key.Name,
                             Qty = g.Sum(p => (p.merged.Qty == null ? 0 : p.merged.Qty)),
                             Price = g.Sum(p => p.merged.Price == null ? 0 : p.merged.Price)
                         };

Maciej Los · Accepted Answer · 2016-03-03T10:03:00

All you need to do is to use GroupBy statement + Select, similar to below example:

C#

var query = dataContext.GroupBy(x=>new {A = x.Field1, B= x.Field2, C = x.Field3)
                       .Select(grp=> new {
                            Field1 = grp.Key.A,
                            Field2Sum = grp.Sum(a=>a.B)}):

Have a look here:
How to: Group Query Results (C# Programming Guide)[^]
101 LINQ Samples in C#[^]

How to use multiple groupby in multiple joins and leftjoin in linq to sql ,

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