我在SQL上很糟糕。我在Access中有一张桌子，有训练师时间表。表格中的每条记录计划包含以下相关字段： 的 course_code 下， 的 training_date 下， 的 START_TIME 下， 的 END_TIME 下， 的训练者下， 的室
我还有一个表 Room ，包含 room_id ， room_name 和 room-capacity 。我的最终目标是返回一个查询，该查询为每个不在日程表中的日期标识每个房间。
例如，如果 Room F 计划在 12/18 ， 12/20 和 12/21上使用，然后我想看看我的决赛桌显示：
12/19 | Room F | 8 capacity
12/22 | Room F | 8 capacity
当我运行日期范围的查询时，12 / 18-12 / 22。
我很接近，但正如我所说，我的SQL不是那么热门：
SELECT Room.room_name, Room.room_capacity, Schedule.training_date
FROM Room LEFT JOIN Schedule ON Room.[room_id] = Schedule.[room]
and (Schedule.training_date) Between [Enter Start Date] And [Enter Ending Date]
WHERE ((Schedule.room) Is Null);
在这种情况下，它产生
| Room F | 8 capacity
我只需要包含每个日期。
答案 0 :(得分：0)
假设每天至少在计划中一次，您可以将其用作“日历”表：
import ais
msg = '177KQJ5000G?tO`K>RA1wUbN0TKH' # a valid AIS encoded string
ais.decode(msg) # this will succeed
ais.decode(msg) # this will fail
ais.decode(msg) # this will succeed
ais.decode(msg) # this will fail, etc
答案 1 :(得分：0)
这显示了如何使用Date Dimension / Calendar表来获取您想要的T-SQL。 SQL的Acces实现很多更原始，但仍然可以修改以下内容。
注意：这也使用日历表来计算周末和假日。
当前时间表：
MS SQL Server 2014架构设置：
CREATE TABLE schedule ( id int, training_date date, room int ) ;
INSERT INTO schedule ( id, training_date, room )
VALUES
(1, '20171218', 1)
, (2, '20171220', 1)
, (3, '20171221', 1)
, (4, '20171205', 3)
, (5, '20171210', 3)
, (6, '20171218', 4)
, (7, '20171220', 4)
;
CREATE TABLE room ( room_id int, room_name varchar(20), room_capacity int ) ;
INSERT INTO room ( room_id, room_name, room_capacity )
VALUES
( 1, 'Room F', 8 )
, ( 2, 'Room X', 42 )
, ( 3, 'Room G', 10 )
, ( 4, 'Room H', 15 )
;
/* ******** MAKE SIMPLE CALENDAR TABLE ******** */
CREATE TABLE dateDim (
theDate DATE NOT NULL
, IsWeekend BIT DEFAULT 0
, IsHoliday BIT DEFAULT 0
, IsWorkDay BIT DEFAULT 0
);
/* Populate basic details of dates. */
INSERT dateDim(theDate, IsWeekend, IsHoliday)
SELECT d
, CONVERT(BIT, CASE WHEN DATEPART(dw,d) IN (1,7) THEN 1 ELSE 0 END)
, CONVERT(BIT, CASE WHEN d = '20171225' THEN 1 ELSE 0 END) /* Christmas. Calc others. */
FROM (
SELECT d = DATEADD(DAY, rn - 1, '20171201')
FROM
(
SELECT TOP (DATEDIFF(DAY, '20171201', '20171231'))
rn = ROW_NUMBER() OVER (ORDER BY s1.[object_id])
FROM sys.all_objects AS s1
CROSS JOIN sys.all_objects AS s2
ORDER BY s1.[object_id]
) AS x
) AS y ;
/* If not a weekend or holiday, it's a WorkDay. */
UPDATE dateDim
SET IsWorkDay = CASE WHEN IsWeekend = 0 AND IsHoliday = 0 THEN 1 ELSE 0 END
;
MS T-SQL查询：
SELECT Room.room_name, Room.room_capacity, dateDim.theDate
FROM Room
CROSS APPLY dateDim /* CROSS APPLY doesn't work in Access */
LEFT JOIN Schedule ON Room.room_id = Schedule.room
AND dateDim.theDate = Schedule.training_date
WHERE Schedule.room Is Null
AND dateDim.isWeekend = 0
AND dateDim.isHoliday = 0
ORDER BY dateDim.theDate, room.room_name
访问查询：我相信这个可以在Access中使用。
SELECT Room.room_name, Room.room_capacity, c1.theDate
FROM Room
INNER JOIN (
SELECT theDate
FROM dateDim
WHERE isWeekend = 0
AND isHoliday = 0
AND theDate BETWEEN '12/15/2017' AND '12/22/2017' -- To filter by your start/end dates
) c1 ON 1=1
LEFT JOIN Schedule ON Room.room_id = Schedule.room
AND c1.theDate = Schedule.training_date
WHERE Schedule.room Is Null
ORDER BY c1.theDate, room.room_name
<强> Results ：
| room_name | room_capacity | theDate |
|-----------|---------------|------------|
| Room F | 8 | 2017-12-01 |
| Room G | 10 | 2017-12-01 |
| Room H | 15 | 2017-12-01 |
| Room X | 42 | 2017-12-01 |
| Room F | 8 | 2017-12-04 |
| Room G | 10 | 2017-12-04 |
| Room H | 15 | 2017-12-04 |
| Room X | 42 | 2017-12-04 |
| Room F | 8 | 2017-12-05 |
| Room H | 15 | 2017-12-05 |
| Room X | 42 | 2017-12-05 |
| Room F | 8 | 2017-12-06 |
| Room G | 10 | 2017-12-06 |
| Room H | 15 | 2017-12-06 |
| Room X | 42 | 2017-12-06 |
| Room F | 8 | 2017-12-07 |
| Room G | 10 | 2017-12-07 |
| Room H | 15 | 2017-12-07 |
| Room X | 42 | 2017-12-07 |
| Room F | 8 | 2017-12-08 |
| Room G | 10 | 2017-12-08 |
| Room H | 15 | 2017-12-08 |
| Room X | 42 | 2017-12-08 |
| Room F | 8 | 2017-12-11 |
| Room G | 10 | 2017-12-11 |
| Room H | 15 | 2017-12-11 |
| Room X | 42 | 2017-12-11 |
| Room F | 8 | 2017-12-12 |
| Room G | 10 | 2017-12-12 |
| Room H | 15 | 2017-12-12 |
| Room X | 42 | 2017-12-12 |
| Room F | 8 | 2017-12-13 |
| Room G | 10 | 2017-12-13 |
| Room H | 15 | 2017-12-13 |
| Room X | 42 | 2017-12-13 |
| Room F | 8 | 2017-12-14 |
| Room G | 10 | 2017-12-14 |
| Room H | 15 | 2017-12-14 |
| Room X | 42 | 2017-12-14 |
| Room F | 8 | 2017-12-15 |
| Room G | 10 | 2017-12-15 |
| Room H | 15 | 2017-12-15 |
| Room X | 42 | 2017-12-15 |
| Room G | 10 | 2017-12-18 |
| Room X | 42 | 2017-12-18 |
| Room F | 8 | 2017-12-19 |
| Room G | 10 | 2017-12-19 |
| Room H | 15 | 2017-12-19 |
| Room X | 42 | 2017-12-19 |
| Room G | 10 | 2017-12-20 |
| Room X | 42 | 2017-12-20 |
| Room G | 10 | 2017-12-21 |
| Room H | 15 | 2017-12-21 |
| Room X | 42 | 2017-12-21 |
| Room F | 8 | 2017-12-22 |
| Room G | 10 | 2017-12-22 |
| Room H | 15 | 2017-12-22 |
| Room X | 42 | 2017-12-22 |
| Room F | 8 | 2017-12-26 |
| Room G | 10 | 2017-12-26 |
| Room H | 15 | 2017-12-26 |
| Room X | 42 | 2017-12-26 |
| Room F | 8 | 2017-12-27 |
| Room G | 10 | 2017-12-27 |
| Room H | 15 | 2017-12-27 |
| Room X | 42 | 2017-12-27 |
| Room F | 8 | 2017-12-28 |
| Room G | 10 | 2017-12-28 |
| Room H | 15 | 2017-12-28 |
| Room X | 42 | 2017-12-28 |
| Room F | 8 | 2017-12-29 |
| Room G | 10 | 2017-12-29 |
| Room H | 15 | 2017-12-29 |
| Room X | 42 | 2017-12-29 |
<强> Access-method Results ：
| room_name | room_capacity | theDate |
|-----------|---------------|------------|
| Room F | 8 | 2017-12-15 |
| Room G | 10 | 2017-12-15 |
| Room H | 15 | 2017-12-15 |
| Room X | 42 | 2017-12-15 |
| Room G | 10 | 2017-12-18 |
| Room X | 42 | 2017-12-18 |
| Room F | 8 | 2017-12-19 |
| Room G | 10 | 2017-12-19 |
| Room H | 15 | 2017-12-19 |
| Room X | 42 | 2017-12-19 |
| Room G | 10 | 2017-12-20 |
| Room X | 42 | 2017-12-20 |
| Room G | 10 | 2017-12-21 |
| Room H | 15 | 2017-12-21 |
| Room X | 42 | 2017-12-21 |
| Room F | 8 | 2017-12-22 |
| Room G | 10 | 2017-12-22 |
| Room H | 15 | 2017-12-22 |
| Room X | 42 | 2017-12-22 |