我有一列单元格的值是这样的：
a
a
b
b
c
c
c
c
d
e
f
f
等等
我正在寻找不重复的值并将它们粘贴到一个新列中。我的伪代码如下：
ActiveSheet.Range("a1").End(xlDown).Select
aend = Selection.Row
for acol= 1 to aend
ActiveSheet.Range("b1").End(xlDown).Select
bend = Selection.Row
'if Cells(1,acol).Value <> any of the values in the range Cells(2,1).Value
'to Cells(2,bend).Value, then add the value of Cells(1,acol) to the end of
'column b.
我在这方面的逻辑有意义吗？我不确定如何对注释部分进行编码。如果这不是最有效的方法，有人可以提出更好的方法吗？非常感谢！
根据您使用的 Excel 版本，您可以使用一些内置的 Excel 功能来获得您想要的 - 整个解决方案取决于您对 VBA 的技能水平。
Excel 2003：
您可以使用范围的Advancedfilter方法（文档）来获取唯一值并将它们复制到您的目标区域。例子：
With ActiveSheet
.Range("A1", .Range("A1").End(xlDown)).AdvancedFilter Action:=xlFilterCopy, CopyToRange:=.Range("B1"), Unique:=True
End With
B1您希望将唯一值复制到的列的第一个单元格在哪里。此方法的唯一问题是源列（“A1”）的第一行即使被复制也会被复制到目标范围。这是因为 AdvancedFilter 方法假定第一行是标题。
因此，添加一个额外的代码行：
With ActiveSheet
.Range("A1", .Range("A1").End(xlDown)).AdvancedFilter Action:=xlFilterCopy, CopyToRange:=.Range("B1"), Unique:=True
.Range("B1").Delete Shift:=xlShiftUp
End With
Excel 2007 / 2010：
您可以使用与上述相同的方法，也可以使用RemoveDuplicates方法（文档）。这类似于 AdvancedFilter 方法，除了RemoveDuplicates就地工作，这意味着您需要复制源列，然后执行过滤，例如：
With ActiveSheet
.Range("A1", .Range("A1").End(xlDown)).Copy Destination:=.Range("B1")
.Range("B1", .Range("B1").End(xlDown)).RemoveDuplicates Columns:=1, Header:=xlNo
End With
最后一个参数Header控制是否将源数据的第一个单元格复制到目标（如果设置为 true，则该方法类似于 AdvancedFilter 方法）。
如果您追求“更纯粹”的方法，那么您可以使用 VBACollection或dictionary- 我相信其他人会为此提供解决方案。
我使用一个不能有重复键的集合来从列表中获取唯一项。尝试将每个项目添加到集合中，并在存在重复键时忽略错误。然后您将拥有一个包含唯一值子集的集合
Sub MakeUnique()
Dim vaData As Variant
Dim colUnique As Collection
Dim aOutput() As Variant
Dim i As Long
'Put the data in an array
vaData = Sheet1.Range("A1:A12").Value
'Create a new collection
Set colUnique = New Collection
'Loop through the data
For i = LBound(vaData, 1) To UBound(vaData, 1)
'Collections can't have duplicate keys, so try to
'add each item to the collection ignoring errors.
'Only unique items will be added
On Error Resume Next
colUnique.Add vaData(i, 1), CStr(vaData(i, 1))
On Error GoTo 0
Next i
'size an array to write out to the sheet
ReDim aOutput(1 To colUnique.Count, 1 To 1)
'Loop through the collection and fill the output array
For i = 1 To colUnique.Count
aOutput(i, 1) = colUnique.Item(i)
Next i
'Write the unique values to column B
Sheet1.Range("B1").Resize(UBound(aOutput, 1), UBound(aOutput, 2)).Value = aOutput
End Sub
为了完整起见，我发布了 Scripting.Dictionary 方法：它是使用 VBA.Collection 的最常见替代方法，它避免了在正常操作中依赖错误处理的需要。
Option Explicit
' Author: Nigel Heffernan
' May 2012 http://excellerando.blogspot.com
' **** THIS CODE IS IN THE PUBLIC DOMAIN ****
'
' You are advised to segregate this code from
' any proprietary or commercially-confidential
' source code, and to label it clearly. If you
' fail do do so, there is a risk that you will
' impair your right to assert ownership of any
' intellectual property embedded in your work,
' or impair your employers or clients' ability
' to do so if the intellectual property rights
' in your work have been assigned to them.
'
Public Function UniqueValues(SourceData As Excel.Range, _
Optional Compare As VbCompareMethod = vbBinaryCompare _
) As Variant
Application.Volatile False
' Takes a range of values and returns a single-column array of unique items.
' The returned array is the expected data structure for Excel.Range.Value():
' a 1-based 2-Dimensional Array with dimensions 1 to RowCount, 1 to ColCount
' All values in the source are treated as text, and uniqueness is determined
' by case-sensitive comparison. To change this, set the Compare parameter to
' to 1, the value of the VbCompareMethod enumerated constant 'VbTextCompare'
' Error values in cells are returned as "#ERROR" with no further comparison.
' Empty or null cells are ignored: they do not appear in the returned array.
Dim i As Long, j As Long, k As Long
Dim oSubRange As Excel.Range
Dim arrSubRng As Variant
Dim arrOutput As Variant
Dim strKey As String
Dim arrKeys As Variant
Dim dicUnique As Object
' Note the late-binding as 'object' - best practice is to create a reference
' to the Windows Scripting Runtime: this allows you to declare dictUnique as
' Dim dictUnique As Scripting.Dictionary and instantiate it using the 'NEW'
' keyword instead of CreateObject, giving slightly better speed & stability.
If SourceData Is Nothing Then
Exit Function
End If
If IsEmpty(SourceData) Then
Exit Function
End If
Set dicUnique = CreateObject("Scripting.Dictionary")
dicUnique.CompareMode = Compare
For Each oSubRange In SourceData.Areas ' handles noncontiguous ranges
'Use Worksheetfunction.countA(oSubRange) > 0 to ignore empty ranges
If oSubRange.Cells.Count = 1 Then
ReDim arrSubRng(1 To 1, 1 To 1)
arrSubRng(1, 1) = oSubRange.Cells(1, 1).Value
Else
arrSubRng = oSubRange.Value
End If
For i = LBound(arrSubRng, 1) To UBound(arrSubRng, 1)
For j = LBound(arrSubRng, 2) To UBound(arrSubRng, 2)
If IsError(arrSubRng(i, j)) Then
dicUnique("#ERROR") = vbNullString
ElseIf IsEmpty(arrSubRng(i, j)) Then
' no action: empty cells are ignored
Else
' We use the error-tolerant behaviour of the Dictionary:
' If you query a key that doesn't exist, it adds the key
dicUnique(CStr(arrSubRng(i, j))) = vbNullString
End If
Next j
Next i
Erase arrSubRng
Next oSubRange
If dicUnique.Count = 0 Then
UniqueValues = Empty
Else
arrKeys = dicUnique.keys
dicUnique.RemoveAll
ReDim arrOutput(1 To UBound(arrKeys) + 1, 1 To 1)
For k = LBound(arrKeys) To UBound(arrKeys)
arrOutput(k + 1, 1) = arrKeys(k)
Next k
Erase arrKeys
UniqueValues = arrOutput
Erase arrOutput
End If
Set dicUnique = Nothing
End Function
几点注意事项：
我会使用一个简单的数组，遍历所有字母并检查您所在的字母是否在数组中：
Sub unique_column()
Dim data() As Variant 'array that will store all of the unique letters
c = 1
Range("A1").Select
Do While ActiveCell.Value <> ""
ReDim Preserve data(1 To c) As Variant
If IsInArray(ActiveCell.Value, data()) = False Then 'we are on a new unique letter and will add it to the array
data(c) = ActiveCell.Value
c = c + 1
End If
ActiveCell.Offset(1, 0).Select
Loop
'now we can spit out the letters in the array into a new column
Range("B1").Value = "Unique letters:"
Dim x As Variant
Range("B2").Select
For Each x In data()
ActiveCell.Value = x
ActiveCell.Offset(1, 0).Select
Next x
Range("A1").Select
c = c - 1
killer = MsgBox("Processing complete!" & vbNewLine & c & "unique letters applied.", vbOKOnly)
End Sub
Function IsInArray(stringToBeFound As String, arr As Variant) As Boolean
IsInArray = (UBound(Filter(arr, stringToBeFound)) > -1)
End Function