excel - Countif on sheet with 700k rows freezes program

Question

我目前有两个列表。 A 列中的“授予者”列表和 B 列中删除重复项的相同列表。我试图使用 countif 计算给定授予者在 A 列中的次数，但是我在 A 列中的列表超过 700k 行.我使用的是 64 位 excel，但每次我运行代码来执行此操作时，excel 都会卡住和崩溃。

有没有办法在 excel 中做到这一点，还是我需要采取另一种方法，比如使用数据透视表或在 Access 中创建表？

我已经写了一些子程序，但这是最新的，来自这个论坛的另一个帖子。

Sub Countif()

  Dim lastrow As Long
  Dim rRange As Range
  Dim B As Long '< dummy variable to represent column B

  B = 2

  With Application
    .ScreenUpdating = False 'speed up processing by turning off screen updating
    .DisplayAlerts = False
  End With

  'set up a range to have formulas applied
  With Sheets(2)
    lastrow = Cells(Rows.Count, "A").End(xlUp).Row
    Set rRange = .Range(.Cells(2, B), .Cells(lastrow, B))
  End With

  'apply the formula to the range
  rRange.Formula = "=COUNTIF($A$2:$A$777363,C2)"
  'write back just the value to the range
  rRange.Value = rRange.Value

  With Application
    .ScreenUpdating = True
    .DisplayAlerts = True
  End With

End Sub

Answer 1

像这样的东西:

Sub Countif()

    Dim allVals, uniqueVals, i As Long, dict, v, dOut(), r As Long

     ''creating dummy data
'    With Sheet2.Range("A2:A700000")
'        .Formula = "=""VAL_"" & round(RAND()*340000,0)"
'        .Value = .Value
'    End With
'

    'get the raw data and unique values
    With Sheet2
        allVals = .Range("A2:A" & .Cells(.Rows.Count, "A").End(xlUp).Row).Value
        uniqueVals = .Range("B2:B" & .Cells(.Rows.Count, "B").End(xlUp).Row).Value
    End With
    ReDim dOut(1 To UBound(uniqueVals, 1), 1 To 1) 'for counts...

    Set dict = CreateObject("scripting.dictionary")
    'map unique value to index
    For i = 1 To UBound(uniqueVals, 1)
        v = uniqueVals(i, 1)
        If Len(v) > 0 Then dict(v) = i
    Next i


    'loop over the main list and count each unique value in colB
    For i = 1 To UBound(allVals, 1)
        v = allVals(i, 1)
        If Len(v) > 0 Then
            If dict.exists(v) Then
                r = dict(v)
                dOut(r, 1) = dOut(r, 1) + 1
            End If
        End If
    Next i

    'output the counts
    Sheet2.Range("C2").Resize(UBound(dOut, 1), 1).Value = dOut

End Sub

在约 30 秒内运行，A 中有 700k 值，B 中有 300k 唯一值