How does .Select method is querying DataTable?

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1

Hello everyone,

I come across a .Select method which I haven’t used so far and seems confusing to me.

MyDataTable.Select(“[Serial_Number]='”+ row(“Serial_Number”).ToString +“'”)

What does this method actually return?

Thanks in advance! :pray:

2

it tries to filter on a particular Serial_Number, but out of context we cannot analyze all and verifying its correctness. Maybe you can share a screenshot with us showing us more details of the implementation. Thanks

Docu

Syntax:

https://www.csharp-examples.net/dataview-rowfilter

3

MyDataTable.Select(“[Serial_Number]=’”+ row(“Serial_Number”).ToString +“’”) is located within For Each row in MyDataTable.

Is there a possibility that a method I’m trying to understand is checking for duplicates in MyDataTable?

4

Hi @bp777

You can use below code to remove duplicates

MyDataTable.DefaultView.ToTable(true,"Col1","Col2",....)

Here true means distinct. If you only want to select some columns with redundant data you can use false and then column names.

Alternatively, you can use the Remove Duplicate Rows activity.

Thanks,
Prankur

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5

Checking for duplicates can be done with different approaches. But first of all lets define the a duplicate:

Duplicate (all columns):
we can remove with

  • Remove Duplicate Rows
  • YourDataTableVar.DefaultView…

We can check with following:
https://forum.uipath.com/t/howto-find-duplicate-nonduplicate-rows-checking-all-columns-without-explicit-listing-the-colnames-index/222597/5

Getting Duplicates (e.g. 1 column):
Can be done with a group by

(From d in YourDataTableVar.AsEnumerable
Group d by k1=d(YourColNameOrIndex).toString.Trim into grp=Group
Where grp.Count > 1
Select g=grp).SelectMany(Function (x) x).CopyToDataTable

When changing the filter condition to Where grp.Count = 1
we will get the unique ones

1 Like
6

I’m sorry for late response.
So, my DataTable looks like this

Serial Number
 80976453
 80968011
 80970818
 80961396
 81131170
 80965776
 80971617
 80963858
 80963595
 80963093

What result will be after MyDataTable.Select(“[Serial_Number]=’”+ row(“Serial_Number”).ToString +“’”)?