主题：[求助]需要救命

直接删除可以参考

Dim idx As String = "-1,"
Dim idx_temp As String = ""
Dim pdr As DataRow = Nothing
Dim count As Integer = 0
Dim cs As String = "第一列,第二列"
For Each dr As DataRow In DataTables("表A").Select("", cs)
    Dim flag As Boolean = False
    If pdr IsNot Nothing Then
        For Each c As String In cs.split(",")
            If pdr(c).replace(" ","") <> dr(c).replace(" ", "") Then
                flag = True
                Exit For
            End If
        Next
        If flag Then
            If count > 1 Then
                idx &= idx_temp
            End If
            count = 1
            idx_temp = ""
        Else
            count += 1
            idx_temp &= dr("_Identify") & ","
        End If
    Else
        count += 1
    End If
    pdr = dr
Next

If count > 1 Then
    idx &= idx_temp
End If

Tables("表A").Filter = "_Identify not In (" & idx.trim(",") & ")"

'DataTables("表A").DeleteFor("_Identify not In (" & idx.trim(",") & ")")

大数据量，建议用sql语句，如果用sql语句，参考

http://www.baidu.com/baidu?wd=sqlserver+%C9%BE%B3%FD%D6%D8%B8%B4&tn=monline_4_dg

 处理速度和你写的代码有关，你重复不断的查，肯定会慢啊。

 具体问题，做实例上来测试。

 参考2楼、3楼方法，不可能慢。慢，说明你查询次数太多。