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hi I want to cut all duplicated rows on datatable and copy to an other datatable like this: datatablefirst: ID Name 123 Joe 123 John 124 Thro 125 Obama 126 Jenifer 127 Jack 127 Arnent 127 Joseph 128 Madonna 129 Mali Datatablenonduplicate: ID Name 124 Thro 125 Obama 126 Jenifer 128 Madonna 129 Mali Datatableduplicate: ID Name 123 Joe 123 John 127 Jack 127 Arnent 127 Joseph
Posted 20-Sep-11 3:28am
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Solution 3

Heres easy and best way to remove duplicate without using for loop.
private DataTable RemoveDuplicatesRecords(DataTable dt)
{
    //Returns just 5 unique rows
    var UniqueRows = dt.AsEnumerable().Distinct(DataRowComparer.Default);
    DataTable dt2 = UniqueRows.CopyToDataTable();
    return dt2;
}
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Solution 1

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Solution 2

You can do something like this. use linq query to retrieve duplicates as shown below. And loop through duplicate rows and add rows into duplicate table. Finally remove duplicates from existing table to get unique rows.
DataTable table=new DataTable();
//DataTable Datatablenonduplicate = table.Clone();
DataTable Datatableduplicate = table.Clone();
var dupsFromCol = from dr in table.AsEnumerable()
                              group dr by dr["ID"] into groups
                              where groups.Count() > 1
                              select groups;
foreach(var duplicate in dupsFromCol)
{
 for(int i=0;i<duplicate.count();i++)>
{
DataRow dr = Datatableduplicate.NewRow();
dr=duplicate.ElementAt(i);
Datatableduplicate.ImportRow(dr);
table.Rows.Remove(dr); 
}
}
table will contain unique rows and datatableduplicate contain duplicates rows.
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Solution 4

with cte
as
(select id,count(id)'Countid' from EMP_TEST1 group by id
)

select E.ID,E.DEPT,E.GrossSalary,E.NAME,E.NetSalary,E.SCM into New_Table from cte c inner join EMP_TEST1 E on E.ID=c.ID where c.Countid>1;

with cte1
as
(select id,count(id)'Countid' from EMP_TEST1 group by id
)
select E.ID,E.DEPT,E.GrossSalary,E.NAME,E.NetSalary,E.SCM into New_Table1 from cte1 c inner join EMP_TEST1 E on E.ID=c.ID where c.Countid=1;


select * from New_Table
select * from New_Table1
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