Count of distinct values from filtered column - excel

Question

I have one Excel sheet with 6000 rows. I need to delete entire rows if distinct values are less than, say, three in one particular column.
Per below example:
In column-A with the list of colours and in column-B with names.
If I filter any 'name in column-B and in column-A, if less than three distinct values = true then entire row should be deleted.
Rows with name- Chary should be deleted.
A B
Color Employee
Red Dev
blue Dev
blue Dev
Red Dev
black Dev
Red Dev
Red Chary
blue Chary
blue Chary
Red Chary
Red Chary
Red Chary
With my code:
First I filter name in column-B then paste the filtered data new workbook and there I will remove duplicates from column-A then will get the unique count.
If the unique count is less than 3 then activate the main sheet and will delete filtered rows and loop to next name.
Sub Del_lessthan_5folois()
Application.ScreenUpdating = False
Application.DisplayAlerts = False
t = Now()
Set wb = ActiveWorkbook
Sheets("VALID ARNS").Activate
iCol = 2 '### criteria column
Set ws = Sheets("VALID ARNS")
Sheets("VALID ARNS").Activate
Set rnglast = Columns(iCol).Find("*", Cells(1, iCol), , , xlByColumns, xlPrevious)
ws.Columns(iCol).AdvancedFilter Action:=xlFilterInPlace, Unique:=True
Set rngUnique = Range(Cells(2, iCol), rnglast).SpecialCells(xlCellTypeVisible)
Workbooks.Add
Set newb = ActiveWorkbook
For Each strItem In rngUnique
If strItem <> "" Then
ws.UsedRange.AutoFilter Field:=iCol, Criteria1:=strItem.Value
newb.Activate
ws.UsedRange.SpecialCells(xlCellTypeVisible).Copy Destination:=[A1]
Application.CutCopyMode = False
Cells.EntireColumn.AutoFit
Dim uniq As Range
Set uniq = Range("A1:S" & Range("A" & Rows.Count).End(xlUp).Row)
uniq.RemoveDuplicates Columns:=7, Header:=xlYes
LastRow = ActiveSheet.UsedRange.Rows.Count
Cells.Delete Shift:=xlUp
Range("A1").Select
wb.Activate
If LastRow < "3" Then
ActiveSheet.AutoFilter.Range.Offset(1,0).Rows.SpecialCells(xlCellTypeVisible).Delete (xlShiftUp)
End If
End If
Next
ws.ShowAllData
MsgBox "The entire process took! " & Format(Now() - t, "hh:mm:ss") & " Minutes"
ActiveSheet.AutoFilterMode = False
Application.ScreenUpdating = True
Application.DisplayAlerts = True
End Sub
My code works in step by step debug mode but when run it skips a lot of rows.
Can this be related to more than 6000 rows?
How do I get the count of distinct values in Column-A when filtered in Column-B?

Answer 1

It's not exactly the same code that you posted as I had some troubles with it, but here's an alternative solution. I simply copy the data into another sheet (please add sheet called "Results" before you run my code), add two more columns with formulas (these will check if a given "Employee" should be deleted), filter on "TRUE" and then delete relevant rows.
From what I tested such solution seems to be faster than applying Advanced Filters, checking for unique values and then looping through the whole dataset. I hope it will work fine for your setup.
Here's the code:
Sub DeleteRows()
Dim t As Variant
Dim iCol As Long, lngLastRow As Long
Dim wsOrig As Worksheet, wsNew As Worksheet
With Application
.ScreenUpdating = False
.DisplayAlerts = False
End With
t = Now()
Set wsOrig = Sheets("VALID ARNS")
Set wsNew = Sheets("Results")
iCol = 2 '### criteria column
With wsOrig
lngLastRow = .Columns(iCol).Find("*", Cells(1, iCol), , , xlByColumns, xlPrevious).Row
'copy into Results sheet
.Range("A1:B" & lngLastRow).Copy wsNew.Range("A1")
With wsNew
'add formulas
.Range("C1:D1").Value = VBA.Array("Instance", "Delete?")
.Range("C2:C" & lngLastRow).Formula = "=COUNTIFS($A$2:A2,A2,$B$2:B2,B2)"
.Range("D2:D" & lngLastRow).Formula = "=SUMIFS($C$2:$C$" & lngLastRow & ",$B$2:$B$" & lngLastRow & ",B2,$C$2:$C$" & lngLastRow & ",1)<3"
'delete when column D = TRUE
.Range("A1:D" & lngLastRow).AutoFilter Field:=4, Criteria1:="TRUE"
.Range("D2:D" & lngLastRow).SpecialCells(xlCellTypeVisible).Rows.Delete
'clear
.Range("A1:B" & lngLastRow).AutoFilter
.Range("C:D").Clear
End With
End With
MsgBox "The entire process took! " & Format(Now() - t, "hh:mm:ss") & " Minutes"
With Application
.ScreenUpdating = True
.DisplayAlerts = True
End With
End Sub
"VALID ARNS" sheet:
"Results" sheet (after running the code):
Edit:
Another option, using Scripting.Dictionary functionality:
Public Function getUnique(ByVal rngVals As Excel.Range) As Variant()
Dim objDictionary As Object
Dim rngRow As Excel.Range
Dim rngCell As Excel.Range
Dim strKey As String
Set objDictionary = CreateObject("Scripting.Dictionary")
For Each rngRow In rngVals.Rows
For Each rngCell In rngRow.Cells
strKey = strKey & "||" & rngCell.Text
Next rngCell
With objDictionary
If Not .Exists(Key:=Mid$(strKey, 3)) Then
Call .Add(Key:=Mid$(strKey, 3), Item:=Mid$(strKey, 3))
End If
End With
strKey = ""
Next rngRow
getUnique = objDictionary.Keys
Set rngVals = Nothing
Set rngRow = Nothing
Set rngCell = Nothing
End Function
Public Sub CountUnique()
Dim rngVals As Excel.Range
Dim varUnique() As Variant
Dim rngCell As Excel.Range
Dim varTemp As Variant
Set rngVals = Sheet3.Range("A2:B13").SpecialCells(12)
varUnique = getUnique(rngVals)
For Each rngCell In rngVals.Columns(2).Cells
varTemp = Filter(varUnique, rngCell.Text, True)
Debug.Print rngCell.Text, UBound(varTemp) - LBound(varTemp) + 1
Erase varTemp
Next rngCell
Set rngVals = Nothing
Set rngCell = Nothing
Erase varUnique
End Sub