suggestions for a macro to find duplicates in a SINGLE column

suggestions for a macro to find duplicates in a SINGLE column

found a lot of questions involving finding duplicates in two columns :

i.e. MS Excel how to create a macro to find duplicates and highlight them? and excel mark duplicates values

However I'm trying to adapt code to be used to find duplicates in one column. For example here is a data set:

Column 1

Foo
Bar
23
23
12
foo
Bar
bart

This is what I'm using right now:

Function warnDupes()    Dim lastRow As Long  Dim dict As Object    ' Let Col be the column which warnDupes operates on.  Dim Col As String    Col = "A"    Set dict = CreateObject("scripting.dictionary")    lastRow = range(Col & Rows.Count).End(xlUp).Row    On Error Resume Next  For i = lastRow To 1 Step -1      If dict.Exists(range(Col & i).value) = True Then        'range("Y" & i).EntireRow.Delete        MsgBox ("Hmm...Seems to be a duplicate of " & range(Col & i).value & _      " in Cell " & Col & i)    End If  dict.Add range(Col & i).value, 1  Next    End Function  

So far I've got some code that does 90% of the job. 23 and 23 are matched. Bar and Bar are matched. etc. So the code matches both Strings and Ints. But I'd like the macro to be able to match Foo and foo as a duplicate as well. How do I make Excel ignore case?

This question ( Function for detecting duplicates in Excel sheet ) seems relevent but I'm having trouble adapting the code or understanding what the author did. Any improvements to the code, explanations or suggestions would be very much appreciated.

Thanks.

UPDATE:

Just noticed something really weird.

The data:

IB6061
IC6071

are matched whether I use my Macro or if I use the Conditional Formatting tool in Excel. Any reason why?

Answer by assylias for suggestions for a macro to find duplicates in a SINGLE column

You could put all the keys in lower case, for example:

Dim myKey as String    For i = lastRow To 1 Step -1      myKey = UCase(range(Col & i).value)      If dict.Exists(myKey) = True Then        'range("Y" & i).EntireRow.Delete        MsgBox ("Hmm...Seems to be a duplicate of " & range(Col & i).value & _      " in Cell " & Col & i)        Else          dict.Add myKey, 1      End If  Next i  

Answer by creamyegg for suggestions for a macro to find duplicates in a SINGLE column

On your Exists() & .Add() lines, make both values the same case:

If dict.Exists(UCase$(Range(Col & i).Value)) Then  

and

dict.Add UCase$(Range(Col & i).Value), 1

That way the duplicates will always be added to the dictionary in uppercase and so case will never matter.

Answer by Siddharth Rout for suggestions for a macro to find duplicates in a SINGLE column

franklin

Why not an Excel formula?

If the values are in Col A then type this in Cell B1 and copy it down?

=IF(COUNTIF(A:A,A1)>1,"It is a duplicate","It is not a duplicate")  

It will also work for cases like "Foo" and "foo"

You can then also use Conditional Formatting using the above formula to highlight duplicates?

FOLLOWUP

The data:

IB6061

IC6071

are matched whether I use my Macro or if I use the Conditional Formatting tool in Excel.

Any reason why?

What formula are you using?

This works for me. Highlight Col A and then use this formula

=COUNTIF(A:A,A1)>1  

See snapshot

Sid

Answer by rkmax for suggestions for a macro to find duplicates in a SINGLE column

This Works for me

Excel 2007

Sub removeDuplicate(rg As Range, col as Integer)      rg.RemoveDuplicates Columns:=col, Header:=xlYes  End Sub  

Excel 2003

' Excel 2003  Option Explicit    Sub DeleteDups(range as String)         Dim x               As Long       Dim LastRow         As Long         ' Range "A65536"       LastRow = Range(range).End(xlUp).Row       For x = LastRow To 1 Step -1           If Application.WorksheetFunction.CountIf(Range("A1:A" & x), Range("A" & x).Text) > 1 Then               Range("A" & x).EntireRow.Delete           End If       Next x     End Sub  

Answer by Jerry Beaucaire for suggestions for a macro to find duplicates in a SINGLE column

You can add

Option Compare Text  

To the VERY TOP of the module, all the code in that module will now compare text non-case-sensitively.

CAT cat CaT cAt

...would all match.

Answer by Micah for suggestions for a macro to find duplicates in a SINGLE column

Building on Siddharth's response, if you want to highlight all instances of duplicates other than the first (to make it easy to simply select all that show up and eliminate them), you could use this modification of his string:

=IF(COUNTIF(A$1:A2,A2)>1,"D","S").

For conditional formatting, it would be like

=COUNTIF(A$1:A2,A2)>1.

This checks only the rows above the current cell, so the first instance of a duplicate will not be highlighted (as it won't have any duplicates above it).

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