Excel VBA, Check values from columns between sheets and delete duplicate - excel

Question

I need some help with comparing values from one column to another and delating it.
so far I have this:
Sub DelateDuplicates()
delArray = Sheets("Save").Range("B1:B") ' saved values
toDelate = Sheets("Validation").Range("B2:B").Value ' values to be checked and delated
lastRow = toDelate.Range("B1000").End(xlUp).Row ' last row
Firstrow = toDelate.Range("B2").End(xlDown).Row ' First row
Dim i As Long
For Lrow = lastRow To Firstrow Step -1
With Worksheets("Validation").Cells(Lrow, "A")
For i = 0 To UBound(delArray) ' arrays are indexed from zero
If Not IsError(.Value) Then
If .Value = delArray(i) Then
.EntireRow.Delete
Exit For
End If
End If
Next
End With
Next Lrow
End Sub
And I do have an error.
"1004 "Application-defined or Object-defined error" "
I have spent 2 days trying to figure it out so far no luck.
Any help will be appreciated.

Answer 1

I modified your code little bit. You can define your first rows and last row the want you want, I have kept it simple for the sake of concept
Option Explicit
Sub DelateDuplicates()
Dim Lrow As Long
Dim delarray()
With Worksheets("Save")
delarray = .Range("B1:B" & .Cells(.Rows.Count, "B").End(xlUp).Row).Value
End With
Dim i As Long
Dim lastrow As Long
Dim firstrow As Long
firstrow = 1
With Worksheets("Validation")
lastrow = .Cells(.Rows.Count, "A").End(xlUp).Row
For Lrow = lastrow To firstrow Step -1
For i = 1 To UBound(delarray)
If Not IsError(.Cells(Lrow, "A").Value) Then
If .Cells(Lrow, "A").Value = delarray(i, 1) Then
.Cells(Lrow, "A").EntireRow.Delete
Exit For
End If
End If
Next i
Next Lrow
End With
End Sub

Answer 2

You can avoid loops within loops by using a Dictionary Object
Option Explicit
Sub DeleteDuplicates()
Dim wsSave As Worksheet, wsValid As Worksheet
Dim iLastRow As Long, iFirstRow As Long, i As Long, n As Long
Dim dict As Object, key, cell As Range
With ThisWorkbook
Set wsSave = .Sheets("Save")
Set wsValid = Sheets("Validation")
End With
Set dict = CreateObject("Scripting.Dictionary")
' get values to delete from Column B
For Each cell In wsSave.Range("B1", wsSave.Cells(Rows.Count, "B").End(xlUp))
key = Trim(cell)
If Len(key) > 0 Then
dict(key) = cell.Row
End If
Next
' scan Validation sheet and delete matching from Save
With wsValid
iFirstRow = .Cells(2, "B").End(xlDown).Row
iLastRow = .Cells(Rows.Count, "B").End(xlUp).Row
For i = iLastRow To iFirstRow Step -1
key = .Cells(i, "A")
If dict.exists(key) Then
.Rows(i).Delete
n = n + 1
End If
Next
End With
' resutl
MsgBox n & " rows deleted between row " & _
iFirstRow & " and " & iLastRow, vbInformation
End Sub