Comparing two data tables on different tabs in Excel using VBA - excel

Question

I am relatively new to Macros and VBA in Excel, so I need some guidance on how to solve my current issue.
The end goal of my project is to have a macro compare two sets of data organized into rows and columns (We'll say table A is the source data, and table B is based off of user input). Each row in table B should correspond to a row in table A, but they could be out of order, or there could be incorrect entries in table B.
My thought is that for the first row in each table, the macro would compare each cell left to right:
If Sheets("sheet1").Cells(2, 1) = Sheets("sheet2").Cells(2, 1) Then
If Sheets("sheet1").Cells(2, 2) = Seets("sheet2").Cells(2, 2)
Ect, ect.
My problem comes in when the Cell in table B does not match Table A.
First, I would want it to check B row 1 against the next row in A, and keep going throughout table A until it finds a "complete match" with all five columns of the row matching.
I've been trying to do this with Else if and For/Next staements
For row= 2 to 10
'if statements go here
Else If Sheets("sheet1").Cells(2, 1) <> Sheets("sheet2").Cells(2, 1)
Next row
I may be completely misunderstanding the syntax here, but I have yet to produce a situation where if the criteria is not met, it goes to the next row.
If no complete match is found, the last cell in table B row 1 that couldn't be matched should be highlighted.
Then regardless of whether a match was found or not, we would move to table B row 2, and start the whole process over.
So, I have the logic worked out (I think), where the comparison ifs would be inside a loop (or something) that would cycle through table A row by row. Then that whole process would be in another loop (or something) that would cycle through Table B.
At the end of the process, there would either be no highlighted cells showing that all entered data is correct, or cells would be highlighted showing data that do no match.
I am fairly certain that the cycling through table B is not the issue. Rather, I'm having difficulty getting the Macro to move to the next table A row if something doesn't match.
Please let me know if I need to elaborate on anything.
Thanks!

Answer 1

You could try:
Option Explicit
Sub test()
Dim Lastrow1 As Long, Lastrow2 As Long, i As Long, j As Long
Dim Str1 As String, Str2 As String
'Find the last row of sheet 1
Lastrow1 = Sheet1.Cells(Sheet1.Rows.Count, "A").End(xlUp).Row
'Find the last row of sheet 2
Lastrow2 = Sheet2.Cells(Sheet2.Rows.Count, "A").End(xlUp).Row
For i = 2 To Lastrow1
'Let us assume that table has 3 columns. Merge 3 columns' values and create a string for each line
Str1 = Sheet1.Cells(i, 1).Value & "_" & Sheet1.Cells(i, 2).Value & "_" & Sheet1.Cells(i, 3).Value
For j = 2 To Lastrow2
'Let us assume that table has 3 columns. Merge 3 columns' values and create a string for each line
Str2 = Sheet2.Cells(j, 1).Value & "_" & Sheet2.Cells(j, 2).Value & "_" & Sheet2.Cells(j, 3).Value
'If both strings match a message box will appear
If Str1 = Str2 Then
MsgBox "Line " & i & " in table A match with line " & j & " in table B!"
Exit For
End If
Next j
Next i
End Sub
Sheet 1 structure:
Sheet 2 structure: