MS Access查询不生成任何值

Question

这段代码早先工作得很好，但今天却没有给我任何价值。尽管可能的结果值已在相关表格中提供。这是有问题的查询。

  Private Sub BR_ID_LostFocus()   
  Dim s As String
  s = "Select Seat_No.Seat_No FROM Seat_No Where Seat_No.Seat_No <= (select    br_info.Seats_Reserved from br_info where Br_info.br_id=forms!pasenger_detail!br_id) AND (Seat_No.Seat_No) NOT IN (SELECT pasenger_detail.seat_no FROM pasenger_detail);"
  Me.Seat_No.RowSource = s
  Me.Seat_No.Requery
  End Sub

Answer 1

1. 子查询中没有过滤NOT IN（SELECT pasenger_detail.seat_no FROM pasenger_detail）;好吗？
2. 表格pasenger_detail是否已打开？
3. 'debug.print形成了什么！pasenger_detail！br_id'打印到即时窗口？