标题：狐表列数据选择中“显示重复内容”和“排除重复内容”的功能在哪里？

'''
Dim T  As String
Dim Da  As DataTable = DataTables("资料")
If  Da.DataCols.Contains("重复") = False Then
    Da.DataCols.Add("重复",GetType(Boolean))
End If

if Da.DataCols("重复").Caption = "不重复" then

    For Each dr As DataRow in Da.Select("[身份证号码] Is Not Null")
        T =  "[身份证号码] ='" &  dr("身份证号码") & "'"
        If Da.Compute("Count(身份证号码)",T) >1 Then
            dr("重复") = True
        Else
            dr("重复") = False
        End If
    Next

    Da.DataCols("重复").Caption = "重复"
   
Else
    Dim Ps As List(Of String)
    Ps = Da.GetUniqueValues("[身份证号码] Is Not Null","身份证号码")

    For Each dr  As DataRow in Da.DataRows
        dr("重复") = False
    Next

    For i As Integer = 0 To Ps.Count-1
       T ="身份证号码 = '" & Ps(i) & "'"
       Da.Find(T)("重复") = True
    Next
    Da.DataCols("重复").Caption = "不重复"

End if
Tables("资料").BuildHeader()
Tables("资料").Filter = "[重复] = True"
Tables("资料").Sort = "身份证号码"