How to compare columns from two different excel workbooks

Question

I have an Excel-Workbook which has two sheets \'Task\' and \'Cities\'. I need to compare the code for validation of records from \'Task\' sheet with that one in \'Cities\' S

Answer 1

I have prepared another workbook with name 'Sample_Data.xlsx' under which I will have a sheet 'cities'.

So where else in the below code I have to make changes to work it correctly; when my 'Sample_Data.xlsx' workbook is closed. The below code opens the workbook; but do not do validation.

Dim CityString As String
Dim CityArray() As String

'Get the last row
'Dim lastRow As Integer
LastRow = Sheets("Task").UsedRange.Rows.Count

Dim wrk As Workbook
Set wrk = Workbooks.Open("E:\Final\Sample_Data.xlsx")

nLastRowSheet2 = wrk.Worksheets("cities").UsedRange.Rows.Count

Dim c As Range
Dim d As Range
Dim e As Variant

'Turn screen updating off to speed up macro code.
'User won't be able to see what the macro is doing, but it will run faster.
Application.ScreenUpdating = False

For Each c In Worksheets("Task").Range("A2:A" & LastRow)
    CityString = c
    CityArray() = Split(CityString, ";")
    For Each e In CityArray()
        e = Trim(e)

        Dim rngFnder As Range
        On Error Resume Next

        Set rngFnder = wrk.Sheets("Cities").Range("A2:A" & nLastRowSheet2).Find(e)

        If rngFnder Is Nothing Then
            c.Interior.Color = vbRed
        End If

        On Error GoTo 0
    Next
Next

Answer 2

When you say "on two different excelssheets" I'm guessing you mean they are in a different Excel workbook file?

When you use the following line you are refering to the sheet "Task" in the active workbook.

Worksheets("Task").Range("A2:A" & LastRow)

You should specify the workbook to avoid writing to the wrong one. Using thisWorkbook refers to the workbook with the code e.g.

ThisWorkbook.Worksheets("Task").Range("A2:A" & LastRow)

To access any open workbook including the current workbook use

Workbooks("example.xls").Worksheets("Task").Range("A2:A" & LastRow)

If the workbook is closed you can open it using

dim wrk as Workbook
set wrk = Workbooks.Open("C:\Docs\example.xls") 
wrk.Worksheets("Task").Range("A2:A" & LastRow)

If you want to know more about workbooks in VBA you can read about them here