How can i sum some numbers with same value in A column? - vba

Question

i have in A column some names and in b column some numbers like:
jimmy 4
jimmy 4
carl 8
john 8
I need to sum jimmy's numbers. I mean, if there are some same values in A colum the sum the B numbers of that name. So jimmy = 8.
How can i do it? I'm very new in vba so the easy things for me are not so easy :)
EDIT, the macro:
Sub Sample()
Dim path As String
Dim openWb As Workbook
Dim openWs As Worksheet
Dim DataInizio As String
Dim DataFine As String
path = "C:\Me\Desktop\example.xls"
Set thiswb = ThisWorkbook
Set openWb = Workbooks.Open(path)
Set openWs = openWb.Sheets("details")
Set Logore = thiswb.Sheets("Log")
With openWs
start = CDate(InputBox("start (gg/mm/aaaa)"))
end = CDate(InputBox("end (gg/mm/aaaa)"))
Sheets("details").Select
LR = Cells(Rows.Count, "A").End(xlUp).Row
dRow = 2
For r = 2 To LR
If Cells(r, 1) >= start And Cells(r, 1) <= end Then
' Do un nome alle colonne nel file di log indicandone la posizione
ore = Range("K" & r)
nome = Range("J" & r)
totore = totore + ore
If ore <> 8 Then
Range("A" & r & ",J" & r & ",D" & r & ",K" & r).Copy Logore.Cells(dRow, 1)
rigatot = dRow
dRow = dRow + 1
End If
If nome <> Range("J" & r + 1) Then
If totore <> 40 Then
Logore.Cells(dRow, 5) = totore
End If
totore = 0
End If
End If
Next
thiswb.Sheets("Log").Activate
End With
openWb.Close (False)
End Sub

Answer 1

Well, this macro will sum up the values and reprint them as a new list. You can specify the columns as String parameters in your Main sub.
CollectArray "A", "D" - collects array from column A and removes duplicates from it and then prints it to column D
DoSum "D", "E", "A", "B" - summs up all values for column D and writes them to column E - gets the match from column A & values from column B
before:
Option Explicit
Sub Main()
CollectArray "A", "D"
DoSum "D", "E", "A", "B"
End Sub
' collect array from a specific column and print it to a new one without duplicates
' params:
' fromColumn - this is the column you need to remove duplicates from
' toColumn - this will reprint the array without the duplicates
Sub CollectArray(fromColumn As String, toColumn As String)
ReDim arr(0) As String
Dim i As Long
For i = 1 To Range(fromColumn & Rows.Count).End(xlUp).Row
arr(UBound(arr)) = Range(fromColumn & i)
ReDim Preserve arr(UBound(arr) + 1)
Next i
ReDim Preserve arr(UBound(arr) - 1)
RemoveDuplicate arr
Range(toColumn & "1:" & toColumn & Range(toColumn & Rows.Count).End(xlUp).Row).ClearContents
For i = LBound(arr) To UBound(arr)
Range(toColumn & i + 1) = arr(i)
Next i
End Sub
' sums up values from one column against the other column
' params:
' fromColumn - this is the column with string to match against
' toColumn - this is where the SUM will be printed to
' originalColumn - this is the original column including duplicate
' valueColumn - this is the column with the values to sum
Private Sub DoSum(fromColumn As String, toColumn As String, originalColumn As String, valueColumn As String)
Range(toColumn & "1:" & toColumn & Range(toColumn & Rows.Count).End(xlUp).Row).ClearContents
Dim i As Long
For i = 1 To Range(fromColumn & Rows.Count).End(xlUp).Row
Range(toColumn & i) = WorksheetFunction.SumIf(Range(originalColumn & ":" & originalColumn), Range(fromColumn & i), Range(valueColumn & ":" & valueColumn))
Next i
End Sub
Private Sub RemoveDuplicate(ByRef StringArray() As String)
Dim lowBound$, UpBound&, A&, B&, cur&, tempArray() As String
If (Not StringArray) = True Then Exit Sub
lowBound = LBound(StringArray): UpBound = UBound(StringArray)
ReDim tempArray(lowBound To UpBound)
cur = lowBound: tempArray(cur) = StringArray(lowBound)
For A = lowBound + 1 To UpBound
For B = lowBound To cur
If LenB(tempArray(B)) = LenB(StringArray(A)) Then
If InStrB(1, StringArray(A), tempArray(B), vbBinaryCompare) = 1 Then Exit For
End If
Next B
If B > cur Then cur = B
tempArray(cur) = StringArray(A)
Next A
ReDim Preserve tempArray(lowBound To cur): StringArray = tempArray
End Sub
after: