CODEWITHSUNDEEP
c#vb.netlinq-to-sql
Narazana
Narazana

Reputation: 1950

LINQ to SQL grouping multiple columns with a distinct row

I have the following table structure. I want to select distinct CustomerId and CustomerName, TotalCost.

Here's the table structure and column data type.

LogId (int)
CustomerId (string)
CustomerName (string)
Cost (int)

Logid / CustomerId / CustomerName / Cost

Update 1

Here's my attempted query so far:

Dim db As New DemoDataContext()

    Dim query = From log In db.LogRecords _
                 Where log.Cost> 10 _
                 Group log By New With {log.CustomerId, log.CustomerName} Into g() _
                 Select New With {g.CustomerId, g.CustomerName, .Cost = g.Sum(Function(log) log.Cost)}

But it makes error message Range variable name can be inferred only from a simple or qualified name with no arguments.

Update 2

Dim queryResult = (From log In db.LogRecords _ 
    Group log By log.CustomerId, log.CustomerName Into Cost = Sum(log => log.Cost ) _ 
    Select New With { CustomerId, CustomerName, TotalCost })

For Each q In queryResult

Next

Error : Name 'queryResult' is not declared.

Upvotes: 3

Views: 6693

Answers (2)

Jeff Mercado
Jeff Mercado

Reputation: 134841

If I understand your requirements correctly, something like this should work in C#:

var query = from row in dataTable
            group row by new { row.CustomerId, row.CustomerName } into g
            select new
            {
                g.Key.CustomerId,
                g.Key.CustomerName,
                Cost = g.Sum(row => row.Cost)
            };

[edit]

I guess my initial thought on why it didn't work was wrong. We just had wrong syntax.

Dim query = From log In db.LogRecords                     _
            Group log By log.CustomerId, log.CustomerName _
                Into Cost = Sum(log => log.Cost)          _
            Select CustomerId, CustomerName, Cost

Upvotes: 4

Tola
Tola

Reputation: 2421

Just an observation. According to what Jeff M wrote and update in the question. 

 Dim queryResult = (From log In db.LogRecords_
            Where log.Cost > 10 _
            Group log By log.CustomerId, log.CustomerName Into Cost = Sum(log.Cost) _
            Select New With {CustomerId, CustomerName, Cost})

Upvotes: 3

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