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原帖由 ychh_wy 于 2011-3-9 20:55 发表
几十万数据用字典不行
查询代码
SELECT A.名称,A.今日,B.值,A.今日-B.值 FROM [今日$] A LEFT JOIN [昨日$] B ON (A.名称=B.名称)
变化最大值
SELECT TOP 1 A.名称,A.今日,B.值,A.今日-B.值 FROM [今日$] A L ...
ado和数组比速度恐怕不行,刚才比较了135169行“昨日”和83969行“今日”,数据都很规范,数组仅用了3S,而ADO用了10S
代码如下:
Sub 宏1() ''字典法 '数据都放在本工作簿(xlsm)
tt = Timer
Dim d As Object, arr, brr(), i&
Set d = CreateObject("scripting.dictionary")
arr = Sheets("昨日").Range("A1").CurrentRegion
For i = 2 To UBound(arr)
d(arr(i, 1)) = arr(i, 2)
Next
arr = Range("A2:B" & Range("A" & Cells.Rows.Count).End(xlUp).Row)
ReDim brr(1 To UBound(arr), 1 To 2)
For i = 1 To UBound(arr)
If d.Exists(arr(i, 1)) Then
brr(i, 1) = d(arr(i, 1))
brr(i, 2) = arr(i, 2) - brr(i, 1)
Else
brr(i, 1) = "昨日无"
brr(i, 2) = arr(i, 2)
End If
Next
Range("c2").Resize(i - 1, 2) = brr
MsgBox Timer - tt
End Sub
Sub Macro1() 'ADO法,数据都放在“100万数据处理.xlsx”,不能使用自连接,因为超过了65536
tt = Timer
Dim cnn As Object, SQL$
Set cnn = CreateObject("ADODB.Connection")
cnn.Open "provider=Microsoft.ACE.OLEDB.12.0;extended properties=excel 12.0;data source=" & ThisWorkbook.Path & "\100万数据处理.xlsx"
SQL = "SELECT A.名称,A.今日,B.值,A.今日-B.值 FROM [今日$] A LEFT JOIN [昨日$] B ON (A.名称=B.名称)"
[e2].CopyFromRecordset cnn.Execute(SQL)
cnn.Close
Set cnn = Nothing
MsgBox Timer - tt
End Sub |
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