Question

我是SQL和Access的新手，想知道你能不能帮忙吗？

我正在使用Access 2010创建酒店预订数据库，但我无法在我搜索空房间的地方工作。

我的数据库有5个表格如下（括号中的字段名称）：

BOOKINGS (BookRef, CustAcctNo, BookDate, ArrivDate, DurStay, EmpNo, RoomNo)
CUSTOMERS (CustAcctNo, Title, Forename, Surname, Address1, Address2, Address3)
EMPLOYEES (EmpNo, Title, Forename, Surname)
ROOM TYPES (RoomType, Description, Rate/Price)
ROOMS (RoomNo, RoomType)

这些表格都有一对多的表格。关系，即一个客户可以有很多预订。

所以，我的想法是感兴趣的领域将是ArrivDate Field（到达日期）和DurStay（Stay of Stay）字段。在房间表中，房间号码是我呼叫的字段。

所以，我到目前为止最接近的是：

PARAMETERS [Start Date] DateTime, [End Date] DateTime;
SELECT R.*, [Start Date] AS Expr1, [End Date] AS Expr2, *
FROM ROOMS AS R 
    LEFT JOIN (SELECT B.RoomNo 
    FROM Bookings AS B 
    WHERE ([Start Date] between B.ArrivDate and (B.ArrivDate + [Please Enter]))  
        AND ([End Date] between B.ArrivDate and (B.ArrivDate + B.DURSTAY))) AS BKD 
    ON R.RoomNo = BKD.RoomNo
    WHERE (((BKD.RoomNo) Is Null));

这根本不适合我。我已经尝试了很多次上面代码的不同版本，但似乎无处可去。我的想法是，我在一个搜索中，在日期和住宿期间之间的字段为空，但也许我会以错误的方式进行搜索，我不确定。

希望我在这里提供了足够的细节，但如果您需要了解更多，请告诉我。我真的很感谢你们至少看过这个。也许对它的新观点可能会发现我出错的地方。

非常感谢您提供任何帮助。

Answer 1

尝试改变：

WHERE ([Start Date] between B.ArrivDate and ... 
    AND ([End Date] between B.ArrivDate and ...

到此：

WHERE ([Start Date] between B.ArrivDate and ... 
    OR ([End Date] between B.ArrivDate and ...

我认为这更符合逻辑，因为它接受部分匹配，即日期重叠。

Answer 2

PARAMETERS [Start Date] DateTime, [End Date] DateTime;
SELECT R.*, [Start Date] AS Expr1, [End Date] AS Expr2, *
FROM ROOMS AS R 
    LEFT JOIN (SELECT B.RoomNo 
    FROM Bookings AS B 
    WHERE ([Start Date] between B.ArrivDate and (B.ArrivDate + **B.DURSTAY**))  
        **OR** ([End Date] between B.ArrivDate and (B.ArrivDate + B.DURSTAY))) AS BKD 
    ON R.RoomNo = BKD.RoomNo
    WHERE (((BKD.RoomNo) Is Null));

或一个更容易，更优雅的查询将是：

SELECT R.*, #06/05/2014# as [Start Date] , #06/10/2014# as [End Date] 
FROM ROOMS AS R    
WHERE R.RoomNo not in 
(
SELECT DISTINCT RoomNo FROM Bookings B
    WHERE (#06/05/2014# between B.Arrival and (B.Arrival + B.Duration))  
        OR (#06/10/2014# between B.Arrival and (B.Arrival + B.Duration)) 
);

日期参数必须以美国格式（#MM / DD / YYYY＃）

传递

Access 2010 - 查询以确定日期范围中的包含

2 个答案: