VBA比较两个Excel数据的异同

代码背景：

• 由于Excel本身无法简单的比较两个Excel数据的异同，所以用VBA编写代码的方式来实现。
• 这里的比较条件是：数据行为单位，假设对应Sheet中没有重复数据，对应数据行的所有列的数据都相等，即为此行数据相同。
• 这里的两个Sheet的数据行量级别大约为：50000 * 50000，数据列大约：50，对应Cell中的字符串大约100以内，中英文混合。
• 如何在Excel中调出VBA的编写工具，请参考如下链接： https://jingyan.baidu.com/article/63f236281f17650208ab3d97.html

整体来说，需求非常明确，代码逻辑比较简单。

相关代码：

Sub CompareData()

Dim i As Long
Dim j As Long

Dim fullSheetName As String
fullSheetName = "Sheet1"
Set fullSheet = Sheets(fullSheetName)
Dim fullDataRange As Variant
fullDataRange = fullSheet.Range("A1", "AN43921").CurrentRegion.Value
Dim fullSheetRowMax As Long
fullSheetRowMax = Range("A1", "AN43921").CurrentRegion.Rows.Count

Dim partialSheetName As String
partialSheetName = "Sheet2"
Set partialSheet = Sheets(partialSheetName)
Dim partialDataRange As Variant
partialDataRange = partialSheet.Range("A1", "AN40000").CurrentRegion.Value
Dim partialSheetRowMax As Long
partialSheetRowMax = partialSheet.Range("A1", "AN40000").CurrentRegion.Rows.Count

Dim columnMax As Integer
columnMax = 40

Dim columnMark As Integer
columnMark = 42

Dim sameRow As Boolean

For i = 1 To fullSheetRowMax
For j = 1 To partialSheetRowMax
sameRow = True
For columnIndex = 1 To columnMax
If IsEmpty(fullDataRange(i, columnIndex)) And Not IsEmpty(partialDataRange(j, columnIndex)) Then
sameRow = False
Exit For
End If
If IsEmpty(partialDataRange(j, columnIndex)) And Not IsEmpty(fullDataRange(i, columnIndex)) Then
sameRow = False
Exit For
End If
If fullDataRange(i, columnIndex) <> partialDataRange(j, columnIndex) Then
sameRow = False
Exit For
End If
Next columnIndex

If sameRow Then
fullSheet.Cells(i, columnMark) = 1
Exit For
End If
Next j
Next i

MsgBox "Successfully!"
End Sub