How to Compare two worksheets' columns, highlight the same values #code

Question

I am a newbie here, also a newbie in VBA.

I have two worksheets that I wanted to compare.

Let's say,

• Sheet1
  • Column DWG. NO
  • Column SYM
• Sheet2
  • Column DWG. NO
  • Column SYM

But the column position of DWG and SYM in sheet2 is not always the same so first I need to locate the positions of the column before comparing. Then highlight the comparison.

Take note also that the sheets have thousands of row data and multiple columns. But only two columns are needed to be compared.

This is the working code:

Sub LookForMatches()
    Dim rng1 As Range, rng2 As Range, c1 As Range, c2 As Range
    Dim rng3 As Range, rng4 As Range, c3 As Range, c4 As Range
'set ranges
    Set rng1 = Sheets("datax").Range("C5", Sheets("datax").Range("C" & Rows.Count).End(xlUp))
    Set rng2 = Sheets("datay").Range("AC4", Sheets("datay").Range("AC" & Rows.Count).End(xlUp))
    Set rng3 = Sheets("datax").Range("F5", Sheets("datax").Range("F" & Rows.Count).End(xlUp))
    Set rng4 = Sheets("datay").Range("AH4", Sheets("datay").Range("AH" & Rows.Count).End(xlUp))

'reset colour
    rng1.Interior.Color = 16777215
    rng2.Interior.Color = 16777215
    rng3.Interior.Color = 16777215
    rng4.Interior.Color = 16777215
'loop values in range
    For Each c1 In rng1
        If Not c1.Interior.ColorIndex = 16777215 And c1 <> "" And c1 <> 0 Then
            For Each c2 In rng2
                If c1 = c2 And c2.Address <> c1.Address Then
                    c1.Interior.Color = RGB(255, 255, 0)
                    c2.Interior.Color = RGB(255, 255, 0)
                End If
            Next c2
        End If
    Next c1
'loop values in next range
    For Each c3 In rng3
        If Not c3.Interior.ColorIndex = 16777215 And c3 <> "" And c3 <> 0 Then
            For Each c4 In rng4
                If c3 = c4 And c4.Address <> c3.Address Then
                    c3.Interior.Color = RGB(255, 255, 0)
                    c4.Interior.Color = RGB(255, 255, 0)
                End If
            Next c4
        End If
    Next c3
    MsgBox ("Checking Done")
    Application.Goto Sheets("datay").Range("AA1"), True
End Sub

But sheet2's column location is defined. However, it should not be defined based on the column number but on the header name because the position of column is varying.

Thank you so much.

Answer 1

I don't understand why you are doing this using VBA: I created two columns, A:A and B:B, and I used conditional formatting to colour cells, based on their presency in column A:A, based on this formula:

=IFNA(MATCH(B2;$A$2:$A$4;0);FALSE)      // for colouring if found
=NOT(IFNA(MATCH(B2;$A$2:$A$4;0);FALSE)) // for colouring otherwise if not found