Select duplicate rows in table in C#

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how to find out the existing lines, and eliminate the existing values?

tanya.png - Google Drive[^]

What I have tried:

I have tried it with looping, it turns out the data is all gone for the NAMA_OLD column

what I want to find is the DUPLIKAT_PENGAWAS column, if there is one that is the same it will delete one of the columns from the NAMA_OLD column.

thanks I need this help

Posted 16-Jul-19 20:37pm

M Ridwan Dwi Septian

Updated 16-Jul-19 21:10pm

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RickZeeland · Answer 1 · 2019-07-16T21:10:00

In SQL that would be something like:

SELECT DUPLIKAT_PENGAWAS FROM Mytable
WHERE (((DUPLIKAT_PENGAWAS) In 
  (SELECT [DUPLIKAT_PENGAWAS] FROM [Mytable] As Tmp GROUP BY [DUPLIKAT_PENGAWAS] 
  HAVING Count(*)>1 )))
ORDER BY DUPLIKAT_PENGAWAS;

For deleting see examples here: delete all duplicate rows in a table (if a row is duplicated once, both rows should be deleted)[^]

You might also be interested in the DISTINCT selection: c# - How to select distinct rows in a datatable and store into an array - Stack Overflow[^]