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Thread: 2 lists, copy unique rows

  1. #1
    VBAX Newbie
    Nov 2013

    2 lists, copy unique rows

    Hi guys,

    I am a novice to marco/vba and am hoping to get some guidance on extracing unique values based on two lists(2 sheets).

    My scenario:
    • Sheet1 has one million lines of serial numbers (master sheet)
    • Sheet2 has 200,000 lines with same format. ColumnA=serial
    • sheet 2 has some new serials and some existing serials
    • Serial is 18 digit number saved as text (dunno of that matters)

    • how can I get vba to check serial agaisnt serial ( Sheet2 ColumnA against Sheet1 column A)
    • extract all new serials (unique of sheet 2 only)
    • unique lines to export to new sheet or replace sheet2

    I am really unsure how to start this... any ideas or pointers?

    I've googled my heart out for a week but haven't found anything that works.. I've found formulas& excel functions but they keep crashing my comp because of large data in sheet 1.

    Thanks in advance for any advice and your time!

  2. #2
    VBAX Mentor
    Jul 2012
    can you attach a very small sample file with data and desired result ?

  3. #3
    VBAX Guru mancubus's Avatar
    Dec 2010
    "A beggar of love, second hand hero...King of Dreams"
    welcome to the forum.

    you want to copy cells from Sheet2 to Sheet3 which are not present in Sheet1.

    this is a VBA solutioun which uses countif formula to detect nonmatching cells.

    i dont know how much time it took to complete the procedure.

    because i left the application after seeing in the progress bar that only 15% of the calculations are completed in 10 minutes with 8 processors.

    i assume A1 contains a header.

    Sub copy_nonmatching_cells()
        Dim Rng
        Dim Calc As Long
        With Application
            .DisplayAlerts = False
            .ScreenUpdating = False
            .EnableEvents = False
            Calc = .Calculation
            .Calculation = xlCalculationManual
        End With
        Set Rng = Worksheets("Sheet2").Range("A2:A" & Cells(Rows.Count, 1).End(xlUp).Row)
        With Rng
            .Offset(, 1).Formula = "=CountIf(Sheet1!A2:A1000000,A2)"
            .Resize(, 2).AutoFilter , Field:=2, Criteria1:="0"
            .Parent.AutoFilter.Range.Columns(1).SpecialCells(xlCellTypeVisible).Copy Sheets("Sheet3").Range("A2")
        End With
        With Application
            .EnableEvents = True
            .Calculation = Calc
        End With
    End Sub

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