Custom Validation Formula To Prevent Duplicate Entries?

Aug 15, 2012

How do I set up a custom validation formula to prevent duplicate enties?

For example I I've already enter the song name 19 and Paul Hardcastle (BandName), how do I set it up where I can not enter that combination again on a row?

I was wanting to use a custom CountIF function but I could not get it to work.

A
B

Song
BandName

19
Paul Hardcastle

[Code] ....

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Prevent Duplicate Entries..

May 8, 2009

New here, I wanna do a "Prevent Duplicate Entries" into my column i try the following: http://www.mrexcel.com/articles/prev...duplicates.php
http://www.theexceladdict.com/_t/t040818.htm

They all work well but if I'm using copy and paste It doesn't work! why is tat so?
Second issue will be i'm wanna do prevent duplication for the whole column not just one cell.

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Copying Row With Prevent Duplicate Entries

May 13, 2009

I've got this code for prevent duplicate entries, But I wondering if it's possible to add a copy rows to it? For Example

Columns C
ItemID ItemName
11 QWE
22 ASD
33 ZXC

So now I enter 22 in ItemID for this working code it will pop up a MsgBox saying Aready exist, Is it possible to add a code so that it will copy the existing copy and paste into the active row?

Private Sub Worksheet_Change(ByVal Target As Range)
Dim r As Range
Dim ans As String
Const myCol As Long = 3
If Intersect(Target, Columns(myCol)) Is Nothing Then Exit Sub
Application.EnableEvents = False.........

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Copying Row With Prevent Duplicate Entries

May 13, 2009

I've got this code for prevent duplicate entries, But I wondering if it's possible to add a copy rows to it? For Example

Columns C
ItemID ItemName
11 QWE
22 ASD
33 ZXC

So now I enter 22 in ItemID for this working code it will pop up a MsgBox saying Aready exist, Is it possible to add a code so that it will copy the existing copy and paste into the active row?

Private Sub Worksheet_Change(ByVal Target As Range)
Dim r As Range
Dim ans As String
Const myCol As Long = 3
If Intersect(Target, Columns(myCol)) Is Nothing Then Exit Sub

[Code] ........

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Dec 30, 2009

Option Explicit
Dim myCount As Byte
Dim myColumn As String
Dim myRow As Long
Sub Worksheet_Change(ByVal Target As Range)
myCount = 0
If Range("B" & myRow).Value <> "" Then myCount = myCount + 1
If Range("C" & myRow).Value <> "" Then myCount = myCount + 1
If Range("D" & myRow).Value <> "" Then myCount = myCount + 1
If Range("E" & myRow).Value <> "" Then myCount = myCount + 1
If myCount > 1 Then....................

The above code pops up the message box when a second entry is made within the specified range, but OK button does not function, contents are not cleared, and Excel locks up.

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