How to Compare Two Rows in Datatable ?

Question

0.00/5 (No votes)

See more:

SQL-Server-2008

, +

Posted 10-Feb-14 1:34am

MurugappanCTS

Updated 10-Feb-14 1:35am

v2

Add a Solution

Comments

sahabiswarup 10-Feb-14 7:54am

try PIVOT function to get your result, or you may use 2 different datatable and then merge them in one final datatable.

2 solutions

Solution 2

try this

SQL

SELECT name, phy, che
FROM (
SELECT name, subject, marks
FROM marks) up
PIVOT (SUM(marks) FOR subject IN (phy, che)) AS pvt

Posted 10-Feb-14 1:53am

King Fisher

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Karthik_Mahalingam · Accepted Answer · 2014-02-10T01:46:00

Hi Murugappan

In DataTable you cannot have duplicate Columns.
What you can do is
Get distinct ID and Name from the table , for that each distinct row you filter the Subjects part into DataRow[] array and then load the array of data into the new table. as SUbject1,Marks1,Subject2,Marks2,Subject3,Marks3

I have done a sample workout for you..
Try to deubg and modify as per your need..enjoy :)

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Data.SqlClient;
using System.Data;
using System.Collections.Concurrent;
class Program
{
    public static void Main(string[] args)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("ID", typeof(int));
        dt.Columns.Add("Name", typeof(string));
        dt.Columns.Add("Subject", typeof(string));
        dt.Columns.Add("Marks", typeof(int));
        dt.Rows.Add(1, "siva", "phy", 80);
        dt.Rows.Add(1, "siva", "che", 60);
        dt.Rows.Add(1, "siva", "mat", 50);
        dt.Rows.Add(1, "siva", "geo", 40);

        // consider max of 4 subjects
        DataTable dtout = new DataTable();
        dtout = dt.Clone();
        dtout.Columns.Add("Subject1", typeof(string)); dtout.Columns.Add("Marks1", typeof(int));
        dtout.Columns.Add("Subject2", typeof(string)); dtout.Columns.Add("Marks2", typeof(int));
        dtout.Columns.Add("Subject3", typeof(string)); dtout.Columns.Add("Marks3", typeof(int));

        DataView view = new DataView(dt);
       DataTable distinctValues = view.ToTable(true, "ID", "Name" );
       foreach (DataRow row in distinctValues.Rows)
       {
           string ID = row["ID"].ToString();
           string Name = row["Name"].ToString();
          var newrow =  dtout.NewRow();
           DataRow[] array = dt.Select("ID=" + ID + " AND Name='" + Name + "'");
           newrow[0] = array[0][0];
           newrow[1] = array[0][1];
           int j = 2;
           for (int i = 0; i < array.Length; i++)
           { 
               
                   newrow[j] = array[i][2];
                   newrow[j +1] = array[i][3];
                   j++; j++;
               
           }
           dtout.Rows.Add(newrow);
             
       }
       
        


    }
}