Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 763
  • Last Modified:

Remove duplicate rows from dataTable

Working in ado.net

I have a DataTable called dt
For the sake of simplicity, it has two columns- column called Name and one called x
I would like to remove a row if the value the Name column in one row is the same as a value in the Name column in another row. The x values may be different but that doesnt matter

Please help.....

0
sebastiz
Asked:
sebastiz
1 Solution
 
roxviperCommented:
0
 
AccessYourBiz_ComCommented:
create a new table called DeleteNames or call it whatever you want. It should have just one field, "Name", same as your Name table. Make it the primary key and save.
Using the duplicate query wizard, create a query of duplicates from the Name table.
Change this query top an Append Query and append the records to the new table "DeleteNames"
Then create another query and include the the DeleteNames table and the other table that you want to delete the records from. Create a join between the two Name columns.
Change this to a Delete Query. Place the askerick from the table you want to delete from in the query grid.
Run the query it will delete the records. If you have a probke with updatable recordset then you muct go an add an index to the Name field of the table you are deleting from.
0
 
AccessYourBiz_ComCommented:
I re-read my post and made some typos corrections. See below:

Create a new table called DeleteNames or call it whatever you want. It should have just one field, "Name", same as your Name table. Make it the primary key and save.
Using the duplicate query wizard, create a query of duplicates from the Name table.
Change this query to an Append Query and append the records to the new table "DeleteNames".
Then create another query and include the "DeleteNames" table and the other table that you want to delete the records from. Create a join between the two Name columns of each table.
Change this duplicates query to a Delete Query. Place the asterick from the table you want to delete the records from onto the query grid. Nother else should be in the query grid.
Run the delete query and it will delete the duplicate records. If you get an error that it is not an updatable recordset then you must add an index to the Name field of the table you are deleting from.
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
Shahan AyyubSenior Software Engineer - iOSCommented:

Hi!

Try this:
  • Create new Datatable dtUnique.
  • Select distibct records via 'distinct' query. like select distinct [name] from [tablename]
  • Copy records in dtUnique.
  • delete 'dt'
0
 
Shahan AyyubSenior Software Engineer - iOSCommented:
sorry distinct not distibct.
0
 
sebastizAuthor Commented:
Hi Shahan

But will a distinct query look at the whole row, or can I select DISTINCT on the basis of an item in a named column being the same in two rows?

 
0
 
Naman GoelCommented:
distinct will give distinct rows on the basis of specified column values

http://social.msdn.microsoft.com/Forums/en-US/adodotnetdataset/thread/ed9c6a6a-a93e-4bf5-a892-d8471b84aa3b
0
 
Shahan AyyubSenior Software Engineer - iOSCommented:
Hi!

Distinct will give you the records on the basis of columns.

This can give an idea what i want to do:

        SELECT Distinct a.*
        FROM [Practice].[dbo].[products] a

This will select all unique records.
0
 
DhaestCommented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now