Check if all column values exists in another list - excel

Question

The excel vba macro I have created goes through an entire column and searches each value in the column against another column found on another worksheet. I have a T/F column where I mark down "T" if it is found, "F" if it is not found. However, I feel like the way I am doing it might not be very efficient, as the macro takes about 30 minutes to go through 31,000 rows of values to be searched from another column with about 27,000 number of values.
For a simple illustration, I have included a few images which explains what the macro does.
Initially the T/F column will be empty. Only after executing the macro, would it be filled. I loop through each row in column A and try to find the value against the SearchCol in the next picture.
Here is the vba code I am currently using.
Sub CheckIfValuesExist()
Dim ActiveWS As Worksheet, WS2 As Worksheet
Dim ValueColLetter As String, SearchColLetter As String, TFColLetter As String
Dim LastRow As Long, i As Long
Dim target As Variant, rng As Range
Set ActiveWS = ActiveWorkbook.Worksheets(1)
Set WS2 = ActiveWorkbook.Worksheets(2)
ValueColLetter = "A"
SearchColLetter = "A"
TFColLetter = "B"
LastRow = ActiveWS.Cells.Find(What:="*", SearchOrder:=xlRows, _
SearchDirection:=xlPrevious, _
LookIn:=xlFormulas).Row
For i = 2 To LastRow
target = ActiveWS.Range(ValueColLetter & i).Value
If target <> "" Then
With WS2.Range(SearchColLetter & ":" & SearchColLetter) 'searches all of column A
Set rng = .Find(What:=target, _
After:=.Cells(.Cells.Count), _
LookIn:=xlValues, _
LookAt:=xlWhole, _
SearchOrder:=xlByRows, _
SearchDirection:=xlNext, _
MatchCase:=False)
If Not rng Is Nothing Then
ActiveWS.Range(TFColLetter & i).Value = "T" 'value found
Else
ActiveWS.Range(TFColLetter & i).Value = "F" 'value not found
End If
End With
End If
Next i
End Sub
The macro works as intended, I just find it to be slow. Is there any better way to do the same thing but in a quicker manner?

Answer 1

Check Column Against Column
Array Match Range Version
Sub CheckIfValuesExist()
Const cSheet1 As Variant = 1 ' Value Worksheet Name/Index
Const cSheet2 As Variant = 2 ' Search Worksheet Name/Index
Const cFirst As Long = 2 ' First Row
Const cVal As Variant = "A" ' Value Column
Const cSrc As Variant = "A" ' Search Column
Const cTF As Variant = "B" ' Target Column
Const cT As String = "T" ' Found String
Const cF As String = "F" ' Not Found String
Dim RngS As Range ' Search Range
Dim vntV As Variant ' Value Array
Dim vntT As Variant ' Target Array
Dim LastV As Long ' Value Last Column Number
Dim LastS As Long ' Search Last Column Number
Dim i As Long ' Value/Target Row Counter
Dim dummy As Long ' Match Dummy Variable
With Application
.Calculation = xlCalculationManual
.ScreenUpdating = False
End With
On Error GoTo ProcedureExit
With ThisWorkbook.Worksheets(cSheet1)
LastV = .Columns(.Cells(1, cVal).Column).Find("*", , -4123, , 2, 2).Row
vntV = .Range(.Cells(cFirst, cVal), .Cells(LastV, cVal))
End With
With ThisWorkbook.Worksheets(cSheet2)
LastS = .Columns(.Cells(1, cSrc).Column).Find("*", , -4123, , 2, 2).Row
Set RngS = .Range(.Cells(cFirst, cSrc), .Cells(LastS, cSrc))
ReDim vntT(1 To UBound(vntV), 1 To 1)
For i = 1 To UBound(vntV)
On Error Resume Next
If vntV(i, 1) <> "" Then
dummy = Application.Match(vntV(i, 1), RngS, 0)
If Err Then
vntT(i, 1) = cF
Else
vntT(i, 1) = cT
End If
End If
On Error GoTo 0
Next
End With
On Error GoTo ProcedureExit
With ThisWorkbook.Worksheets(cSheet1)
.Range(.Cells(cFirst, cTF), .Cells(.Rows.Count, cTF)).ClearContents
.Cells(cFirst, cTF).Resize(UBound(vntT)) = vntT
End With
ProcedureExit:
With Application
.Calculation = xlCalculationAutomatic
.ScreenUpdating = True
End With
End Sub

Answer 2

Let us assume that data included in Sheet 1.
Try:
Option Explicit
Sub VlookUp()
Dim LastRowSV As Long, LastRowV As Long, Counts As Long
Dim wsName As String
Dim wsListSV As Range, cellSV As Range, wsListV As Range, cellV As Range
With ThisWorkbook.Worksheets("Sheet1")
'Find the last row of Search Values
LastRowSV = .Cells(.Rows.Count, "D").End(xlUp).Row
'Find the last row of Values
LastRowV = .Cells(.Rows.Count, "A").End(xlUp).Row
'Set the list with the Search Values
Set wsListSV = .Range(Cells(2, 4), Cells(LastRowSV, 4))
'Set the list with the Values
Set wsListV = .Range(Cells(3, 1), Cells(LastRowV, 1))
'Loop each value in Search Values
For Each cellV In wsListV
Counts = Application.WorksheetFunction.CountIf(wsListSV, cellV)
If Counts <> 0 Then
cellV.Offset(0, 1).Value = "T"
Else
cellV.Offset(0, 1).Value = "F"
End If
Next
End With
End Sub
Result:

Answer 3

Why don't you use the MATCH formula?
If your values are in Col A and the search values are at
the cells $F$5:$F$10 the formula is:
=MATCH(A2,$F$5:$F$10,0)
or if you insist on a T/F result:
=IF(ISERROR(MATCH(A2,$F$5:$F$10,0)),"T","F")
Of cause you can insert this formula also with a macro.