标题：判断数据是否存在？

如何查找第一列数据重复的行，并把后面的重复行删除？

Dim idx As String = "-1,"
Dim pdr As DataRow = Nothing
Dim cs As String = "客户,工序"
Dim flag As Boolean
For Each dr As DataRow In DataTables("询价表").Select("客户 is not null and 工序 is not null", cs)
    flag = False
    If pdr IsNot Nothing Then
        For Each c As String In cs.split(",")
            If pdr(c) <> dr(c) Then
                flag = True
                Exit For
            End If
        Next
    End If
    If flag Then
        idx &= pdr("_Identify") & ","
    End If
    pdr = dr
Next

If pdr IsNot Nothing Then
    idx &= pdr("_Identify") & ","
End If

Tables("询价表").filter = "_Identify in (" & idx.trim(",") & ") and 客户 is not null and 工序 is not null"