在上下文中指定的非布尔型，其中一个条件预计

Question

在上下文中指定的非布尔型，其中一个条件是出乎意料的时候我将鼠标放置在顶线看到图像的表达式的表达式：

Sql image problem

SELECT Bookings.Date, Bookings.Timebegan, Bookings.Timefinished, Bookings_1.Date, Bookings_1.Timebegan, Bookings_1.Timefinished, 
       Bookings.RoomID, Bookings_1.RoomID 
FROM  Bookings, 
       Bookings AS Bookings_1 
WHERE Not Nz(([Bookings_1].[Timebegan]>=[Bookings].[Timefinished]) Or 
    ([Bookings_1].[Timefinished]<=[Bookings].[Timebegan]) Or 
    ([Bookings].[RoomID]!=[Bookings_1].[RoomID]) Or 
    ([Bookings].[ID]=[Bookings_1].[ID]),False) 
ORDER BY Bookings.ID, Bookings_1.ID; 

有没有人有任何想法？

Answer 1

好谜语（德摩根法则提醒;））。试试这个：

WHERE 
    (
     [Bookings_1].[Timebegan] is NULL 
     OR [Bookings].[Timefinished] is NULL 
     OR [Bookings_1].[Timefinished] is NULL 
     OR [Bookings].[Timebegan] is NULL 
     OR [Bookings].[RoomID] is NULL 
     OR [Bookings_1].[RoomID] is NULL 
     OR [Bookings].[ID] is NULL 
     OR [Bookings_1].[ID] is NULL 
     OR 
     (
     [Bookings_1].[Timebegan]<[Bookings].[Timefinished] 
     AND [Bookings_1].[Timefinished]>[Bookings].[Timebegan] 
     AND [Bookings].[RoomID]=[Bookings_1].[RoomID] 
     AND [Bookings].[ID]<>[Bookings_1].[ID] 
     ) 
    )