问题
I am having trouble finding the available time for HALF-an-hour and One-hour time slots for a particular Treatment - on a selected date. User has options of selecting HALF-an-hour and One-hour at the booking end example = On a selected date - there is a booking for 9am for 1 hour (9am to 10am) and there is another booking - 11am for HALF-an-hour (11am to 11:30am) then the user should not see these two slots on the same selected day He should get this on the display(after selecting the treater and date)
Half an Hour:
- 9am to 930 am ❌ (not available)
- 930am to 10am ❌ (not available)
- 10-am -to 1030 ✅ (available)
- 1030 to 11am ✅ (available)
- 11am to 11:30 ❌ (not available)
11:30 to 1200pm ✅ (available) and so on................... .
One Hour
9am to 10am ❌ (not available)
- 10am to 11am ✅ (available)
- 11am to 12pm ❌ (not available), (((((here if possible we ca make 1130am to 12:30pm ✅ (available), and then sequence continues from 12:30 and so on....)))
- 12pm to 1pm ✅ (available)
1pm to 2pm ✅ (available) and so on---------------------------
I tried to do it like this.
I created two tables - one for HALF-an-hour slots and - one for ONE-hour slots.
these two tables have timebegin and timeEnd
I have another table that has the booked entries.
I tried with EXCEPT in SQl - but that seems to be giving wrong results
SELECT T1.timeBegin from ClinicNew.HalfTiming T1
left join ClinicNew.FullTiming T2
On T1.TimeBegin=T2.TimeBegin
EXCEPT
select distinct T1.timeBegin from ClinicNew.HalfTiming T1
inner join ClinicNew.NewTreaterEngagedDTM T2
On T1.timeBegin = T2.timeBegin
where T2.BookedDate = '2014-04-15'
and T2.TreaterID=Please help
回答1:
I think you're probably overcomplicating this by having multiple tables for time slots of different lengths. What happens when you want to go to 15-minute intervals rather than 30? What happens when you want to allow 90-minute appointments? What happens if the office scheduling these appointments has different hours on different days?
The solution I propose below uses one table to store appointments, and that's it. The rest of the logic shown could easily go into a stored procedure or something that you call when you want a list of available appointments for a given date. Hopefully the comments are sufficient to explain what's going on.
-- Sample data from the question.
declare @Appointment table
(
[ID] bigint not null identity(1, 1), -- Primary key.
[BookedDate] date not null, -- The date of the appointment.
[Time] time(0) not null, -- The start time of the appointment.
[Duration] int not null -- The length of the appointment in minutes.
);
insert @Appointment
([BookedDate], [Time], [Duration])
values
('2014-04-15', '09:00', 60),
('2014-04-15', '10:00', 30),
('2014-04-15', '17:00', 60),
('2014-04-15', '18:30', 30);
-- @StartTime is the time the office opens on the desired date.
-- @EndTime is the time the office closes on the desired date.
-- @Interval is the number of minutes that separate potential appointment times.
-- @DesiredDate is the date on which an appointment is requested.
-- @DesiredLength is the length of the requested appointment in minutes.
declare @StartTime time(0) = '09:00';
declare @EndTime time(0) = '21:00';
declare @Interval int = 30;
declare @DesiredDate date = '2014-04-15';
declare @DesiredLength int = 30;
-- This CTE enumerates all potential timeslots on the @DesiredDate given the above data.
with [TimeSlotCTE] as
(
-- Base case: the first appointment slot of the day.
select
[From] = @StartTime,
[To] = dateadd(minute, @DesiredLength, @StartTime)
union all
-- Recursive case: create a subsequent appointment slot as long as doing so won't
-- take us past the office's closing time.
select
dateadd(minute, @Interval, [From]),
dateadd(minute, @Interval, [To])
from
[TimeSlotCTE]
where
dateadd(minute, @Interval, [To]) <= @EndTime
)
-- Finally, we simply select every time slot defined above for which there does not
-- yet exist an overlapping appointment on the requested date.
select
[T].[From],
[T].[To],
[Available] =
case when exists
(
select 1 from @Appointment [A]
where
-- Forgot this line the first time around!
[A].[BookedDate] = @DesiredDate and
[A].[Time] < [T].[To] and
dateadd(minute, [A].[Duration], [A].[Time]) > [T].[From]
)
then 'No' else 'Yes' end
from
[TimeSlotCTE] [T];
Here's the output if I run the above code with @DesiredLength = 30:
From To Available
09:00:00 09:30:00 No
09:30:00 10:00:00 No
10:00:00 10:30:00 No
10:30:00 11:00:00 Yes
11:00:00 11:30:00 Yes
11:30:00 12:00:00 Yes
12:00:00 12:30:00 Yes
12:30:00 13:00:00 Yes
13:00:00 13:30:00 Yes
13:30:00 14:00:00 Yes
14:00:00 14:30:00 Yes
14:30:00 15:00:00 Yes
15:00:00 15:30:00 Yes
15:30:00 16:00:00 Yes
16:00:00 16:30:00 Yes
16:30:00 17:00:00 Yes
17:00:00 17:30:00 No
17:30:00 18:00:00 No
18:00:00 18:30:00 Yes
18:30:00 19:00:00 No
19:00:00 19:30:00 Yes
19:30:00 20:00:00 Yes
20:00:00 20:30:00 Yes
20:30:00 21:00:00 Yes
Here it is with @DesiredLength = 60:
From To Available
09:00:00 10:00:00 No
09:30:00 10:30:00 No
10:00:00 11:00:00 No
10:30:00 11:30:00 Yes
11:00:00 12:00:00 Yes
11:30:00 12:30:00 Yes
12:00:00 13:00:00 Yes
12:30:00 13:30:00 Yes
13:00:00 14:00:00 Yes
13:30:00 14:30:00 Yes
14:00:00 15:00:00 Yes
14:30:00 15:30:00 Yes
15:00:00 16:00:00 Yes
15:30:00 16:30:00 Yes
16:00:00 17:00:00 Yes
16:30:00 17:30:00 No
17:00:00 18:00:00 No
17:30:00 18:30:00 No
18:00:00 19:00:00 No
18:30:00 19:30:00 No
19:00:00 20:00:00 Yes
19:30:00 20:30:00 Yes
20:00:00 21:00:00 Yes
Will something like this work for you?
来源：https://stackoverflow.com/questions/31835935/half-an-hour-and-one-hour-time-slot-booking-based-on-selection-c-sharp-and-sql