Excel macro: Combine rows if column match - vba

Question

I want to be able to combine the rows for which the value in the first column matches, so that the values of non-blank cells are consolidated into one row. E.g.:
Mary Smith, A, [blank cell]
Mary Smith, [blank cell], B
-->
Mary Smith A B
I've tried to use the code below:
Dim RowNum As Long, LastRow As Long
Application.ScreenUpdating = False
RowNum = 4
LastRow = Cells.SpecialCells(xlCellTypeLastCell).Row
Range("A4", Cells(LastRow, 13)).Select
For Each Row In Selection
With Cells
If Cells(RowNum, 1) = Cells(RowNum + 1, 1) Then
Cells(RowNum + 1, 1).Copy Destination:=Cells(RowNum, 1)
Cells(RowNum + 1, 2).Copy Destination:=Cells(RowNum, 2)
Cells(RowNum + 1, 3).Copy Destination:=Cells(RowNum, 3)
Cells(RowNum + 1, 4).Copy Destination:=Cells(RowNum, 4)
Cells(RowNum + 1, 5).Copy Destination:=Cells(RowNum, 5)
Cells(RowNum + 1, 6).Copy Destination:=Cells(RowNum, 6)
Cells(RowNum + 1, 7).Copy Destination:=Cells(RowNum, 7)
Cells(RowNum + 1, 8).Copy Destination:=Cells(RowNum, 8)
Cells(RowNum + 1, 9).Copy Destination:=Cells(RowNum, 9)
Cells(RowNum + 1, 10).Copy Destination:=Cells(RowNum, 10)
Cells(RowNum + 1, 11).Copy Destination:=Cells(RowNum, 11)
Cells(RowNum + 1, 12).Copy Destination:=Cells(RowNum, 12)
Cells(RowNum + 1, 13).Copy Destination:=Cells(RowNum, 13)
Rows(RowNum + 1).EntireRow.Delete
End If
End With
RowNum = RowNum + 1
Next Row
Application.ScreenUpdating = True
'
End Sub
This does a fine job of consolidating the data so that there are only unique values in the first column, HOWEVER, when the row is copied up, the values of blank cells copy over populated cells, which NOT what I want. So for instance, running this macro on the above data would yield:
Mary Smith, A, [blank cell]
Mary Smith, [blank cell], B
-->
Mary Smith, A, [blank cell]
Any insight into how I might modify the above code (or use something more elegant) would be appreciated!!

Answer 1

This will do it very quickly:
Sub foo()
Dim ws As Worksheet
Dim lstrow As Long
Set ws = Sheets("Sheet1") ' Change to your sheet
With ws
lstrow = .Range("A" & .Rows.Count).End(xlUp).Row
With .Range("B4:M" & lstrow)
.Offset(, 26).FormulaR1C1 = "=IFERROR(INDEX(R4C[-26]:R" & lstrow & "C[-26],MATCH(1,INDEX((R4C1:R" & lstrow & "C1 = RC1)*(R4C[-26]:R" & lstrow & "C[-26] <>""""),),0)),"""")"
ws.Calculate
.Value = .Offset(, 26).Value
.Offset(, 26).ClearContents
End With
With .Range("A4:M" & lstrow)
.Value = .Value
.RemoveDuplicates 1, xlGuess
End With
End With
End Sub
It basically uses the formula: =INDEX(B$4:B$4,MATCH(1,INDEX(($A$4:$A$4 = $A4)*(B$4:B$4 <>""),),0)) To find all the values. Puts those formulas in blank columns and then copies the data back and removes the duplicates.
This will do all 13 columns at once.
It also does not care how many times the value in Column A is repeated. There could be 4 Mary Smiths in that column. It will grab the first value in each column and use that.
Before:
After:

Answer 2

Try the below code
Sub test()
LastRow = Range("A" & Rows.Count).End(xlUp).Row
For i = 4 To LastRow
If ((Range("A" & i).Value = Range("A" & i + 1).Value) And (Range("B" & i).Value <> Range("B" & i + 1).Value) And ((Range("B" & i).Value = "") Or (Range("B" & i + 1).Value = "")) And (Range("C" & i).Value <> Range("C" & i + 1).Value) And ((Range("C" & i).Value = "") Or (Range("C" & i + 1).Value = ""))) Then
If Range("B" & i).Value = "" Then
Range("B" & i).Value = Range("B" & i + 1).Value
ElseIf Range("B" & i + 1).Value = "" Then
Range("B" & i + 1).Value = Range("B" & i).Value
End If
If Range("C" & i).Value = "" Then
Range("C" & i).Value = Range("C" & i + 1).Value
ElseIf Range("C" & i + 1).Value = "" Then
Range("C" & i + 1).Value = Range("C" & i).Value
End If
End If
Range("B" & i).EntireRow.Delete Shift:=(xlUp)
LastRow = LastRow - 1
Next i
End Sub

Answer 3

Here is another approach.
Create a Personnel object. Each Personnel object can have multiple attributes (the non blank column entries in your original table).
By using the Key property of the collection object, and using the Name (column1 data) as the key, we can detect duplicates without having to sort the original data. And the number of attributes for each name is limited only by the size of the worksheet.
Other information is in the comments.
Insert a class object and rename it cPersonnel
Below is the code for the Class and Regular modules
Class Module
Option Explicit
Private pName As String
Private pAttrib As String
Private pAttribs As Collection
Public Property Get Name() As String
Name = pName
End Property
Public Property Let Name(Value As String)
pName = Value
End Property
Public Property Get Attrib() As String
Attrib = pAttrib
End Property
Public Property Let Attrib(Value As String)
pAttrib = Value
End Property
Public Property Get AttribS() As Collection
Set AttribS = pAttribs
End Property
Public Function ADDAttribS(Value As String)
pAttribs.Add Value
End Function
Private Sub Class_Initialize()
Set pAttribs = New Collection
End Sub
Regular Module
Option Explicit
Sub PersonnelAttribs()
Dim wsSrc As Worksheet, wsRes As Worksheet, rRes As Range
Dim vSrc As Variant, vRes() As Variant
Dim cP As cPersonnel, colP As Collection
Dim LastRow As Long, LastCol As Long
Dim I As Long, J As Long
'Set source and results worksheets, ranges
Set wsSrc = Worksheets("sheet1")
Set wsRes = Worksheets("sheet2")
Set rRes = wsRes.Cells(1, 1)
With wsSrc.Cells
LastRow = .Find(what:="*", after:=.Cells(1, 1), LookIn:=xlFormulas, _
searchorder:=xlByRows, searchdirection:=xlPrevious).Row
LastCol = .Find(what:="*", after:=.Cells(1, 1), LookIn:=xlFormulas, _
searchorder:=xlByColumns, searchdirection:=xlPrevious).Column
End With
'Read source data into array
With wsSrc
vSrc = Range(.Cells(1, 1), .Cells(LastRow, LastCol))
End With
'create and collect the Personnel objects
'Source data does not need to be sorted
Set colP = New Collection
On Error Resume Next
For I = 1 To UBound(vSrc, 1)
If Trim(vSrc(I, 1)) <> "" Then
Set cP = New cPersonnel
With cP
.Name = vSrc(I, 1)
For J = 2 To UBound(vSrc, 2)
If Trim(vSrc(I, J)) <> "" Then
.Attrib = Trim(vSrc(I, J))
.ADDAttribS .Attrib
End If
Next J
colP.Add cP, .Name
Select Case Err.Number
Case 457 'duplicate name
Err.Clear
For J = 1 To .AttribS.Count
colP(.Name).ADDAttribS .AttribS(J)
Next J
Case Is <> 0
Debug.Print Err.Number, Err.Description
Stop
End Select
End With
End If
Next I
On Error GoTo 0
'Create results array
'Number of columns
For I = 1 To colP.Count
With colP(I)
J = IIf(J > .AttribS.Count, J, .AttribS.Count)
End With
Next I
ReDim vRes(0 To colP.Count, 0 To J)
'Headers
vRes(0, 0) = "Name"
For J = 1 To UBound(vRes, 2)
vRes(0, J) = "Attrib " & J
Next J
'Populate data
For I = 1 To colP.Count
With colP(I)
vRes(I, 0) = .Name
For J = 1 To .AttribS.Count
vRes(I, J) = .AttribS(J)
Next J
End With
Next I
'Clear old data and write new
Set rRes = rRes.Resize(UBound(vRes, 1) + 1, UBound(vRes, 2) + 1)
With rRes
.EntireColumn.Clear
.Value = vRes
With .Rows(1)
.Font.Bold = True
.HorizontalAlignment = xlCenter
End With
.EntireColumn.AutoFit
End With
End Sub
Original Data
Results after Macro