Excuting a query in linq

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I have a query in sql but I have to use Linq to perform the same operation How can I do this ?
The query is :

SQL

SELECT sum(credit) - sum(debit) AS Bal, date
FROM AccData
GROUP BY date;

I have written a query but that certainly seems wrong as it has multiple errors, please help.
I have with me a Data Table AccData on which this query has to be performed

Posted 24-Apr-12 23:20pm

sagar wasule

Updated 24-Apr-12 23:23pm

Prasad_Kulkarni

v2

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pietvredeveld 25-Apr-12 5:32am

Posting some code of what you have done, can help us to help you!
Piet

sagar wasule 25-Apr-12 5:53am

I have received a datatable from another method , I'm writing a method to perform operation on this particular datatable according to the query I wrote above using Linq.

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VJ Reddy · Accepted Answer · 2012-04-25T00:04:00

The following LINQ query can be used to obtain the above results

C#

void Main()
{
    DataTable accData = new DataTable();
    accData.Columns.Add("Date",typeof(DateTime),null);
    accData.Columns.Add("Credit",typeof(double),null);
    accData.Columns.Add("Debit",typeof(double),null);
    
    accData.Rows.Add(new DateTime(2012,03,24),500,300);
    accData.Rows.Add(new DateTime(2012,03,24),350,275);
    accData.Rows.Add(new DateTime(2012,03,24),400,200);
    accData.Rows.Add(new DateTime(2012,03,25),250,100);
    accData.Rows.Add(new DateTime(2012,03,25),350,150);
    accData.Rows.Add(new DateTime(2012,03,27),250,75);
    accData.Rows.Add(new DateTime(2012,03,27),175,50);
    
    DataTable balance = new DataTable();
    balance.Columns.Add("Date",typeof(DateTime),null);
    balance.Columns.Add("Bal",typeof(double),null);
    
   
    accData.AsEnumerable().GroupBy (row =>row.Field<datetime>("Date"))
    .Select (row => {DataRow balRow = balance.NewRow(); 
    	balRow["Date"]=row.Key;
    	balRow["Bal"]=row.Sum (r => r.Field<double>("Credit"))
    				  - row.Sum (r => r.Field<double>("Debit"));
    	return balRow;}).CopyToDataTable(balance,LoadOption.OverwriteChanges);
}
//Contents balance DataTable
//
//Date                  Bal
//24/3/2012 12:00:00 AM 475 
//25/3/2012 12:00:00 AM 350 
//27/3/2012 12:00:00 AM 300

[Edit]Group Data for illustration as noted in the comment to this solution[/Edit]

C#

//Key=  24/3/2012 12:00:00 AM 
//
//Date             Credit Debit
//24/3/2012 12:00:00 AM 500 300 
//24/3/2012 12:00:00 AM 350 275 
//24/3/2012 12:00:00 AM 400 200 
// 
//Key=  25/3/2012 12:00:00 AM 
//
//Date             Credit Debit
//25/3/2012 12:00:00 AM 250 100 
//25/3/2012 12:00:00 AM 350 150 
// 
//Key=  27/3/2012 12:00:00 AM 
//
//Date             Credit Debit
//27/3/2012 12:00:00 AM 250 75 
//27/3/2012 12:00:00 AM 175 50