[求助]如何筛选列空白的数据 - 专家坐堂 - Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

想增加一个条件，同时筛选“登记时间”列中值为空的数据，同时也需要以下的条件，需要加什么语名句

Tables("进出单表").Filter =“登记时间” IsNull

加了上面这句筛不出来。

Dim sd As WinForm.DateTimePicker = e.Form.Controls("开始时间")
Dim ed As WinForm.DateTimePicker = e.Form.Controls("结束时间")

Dim Filter   As   String
With e.Form.Controls("开始时间")
    If .Value   IsNot   Nothing   Then
        If Filter >""   Then
            Filter = Filter &   " And "
        End   If
        Filter = Filter &   "要求出单时间 >= #" & sd .Value &   "#"
    End   If
End   With
With e.Form.Controls("结束时间")
    If .Value   IsNot   Nothing   Then
        If Filter >""   Then
            Filter = Filter &   " And "
        End   If
        Filter = Filter &   "要求出单时间 <= #" & ed .Value &   "#"
    End   If
End   With
If   Filter >   "" Then
    Tables("进出单表").Filter =   Filter
End If
Tables("进出单表").Sort = "要求出单时间"

主题：[求助]如何筛选列空白的数据