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我有一个现有的存储过程，我用它来获取我的数据库系统的可用预订。我目前通过属性显示当前日期以显示特定日期的所有预订。我想要做的是将日期范围（使用CTE）作为查询的“日期”部分，以便我可以在完整范围内获取所有预订，而不仅仅是一天。转换存储过程使用日期CTE而不是单一日期
下面是我现有的存储过程：正如你可以在下面看到的，我在我的select语句（和子查询）中使用@CurrentDay属性。我如何使用CTE（在帖子的底部），基本上“为每个”而不是使用当前传入的日期？
ALTER PROCEDURE [dbo].[GetUpcomingTrialSlots]
@LocationId int,
@CurrentDateTime datetime
AS
BEGIN
declare @CurrentDay Date
declare @WindowTimeStart DateTime
set datefirst 1
select @CurrentDay = CONVERT(date, @CurrentDateTime)
select @WindowTimeStart = CONVERT(time,@CurrentDateTime)
-- Day One
SELECT * FROM
(
select ts.id TimeSlotId,
@locationId LocationId,
@CurrentDay BookingDay,
datename(dw,DATEPART(dw, @CurrentDay)-1) DayOfWeek,
ts.StartTime,
COALESCE(
(select top 1 AvailableSlots
FROM TrialTimeBlockOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.EndTime AS DATETIME))
between
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId
)
,
(select top 1 AvailableSlots from TrialTimeBlock where DayOfWeek = DATEPART(dw, @CurrentDay)
and ts.StartTime >= starttime and ts.StartTime < endtime and LocationId = @LocationId)
) as AvailableSlots,
ts.EndTime,
case
when
EXISTS (select * from TrialTimeBlock where ts.StartTime >= StartTime and ts.StartTime < EndTime and LocationId = @LocationId and DayOfWeek = datepart(dw, @CurrentDay)) THEN CAST(1 AS BIT)
else CAST(0 AS BIT)
end as TrialSlot,
case
when
EXISTS (
SELECT *
FROM TrialTimeBlockOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
>=
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
<
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId
and
AvailableSlots = 0
) THEN 0 /*This doesn't seem right to me */
else 1
end as [TrialTimeAvailable],
case
when
EXISTS (
SELECT *
FROM OpeningHourOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
>=
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
<
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId
and
AvailableSlots = 0
) THEN 'Closed' /*This doesn't seem right to me */
else 'Open'
end as [OpenStatus],
case
when
(select count(*) from InitialAssessment where LocationId = @LocationId and TimeSlotId = ts.Id and AssessmentDate = @CurrentDay) > 1 THEN 'true'
else 'false'
end as HasAssessment,
(select count(*) from InitialAssessment where LocationId = @LocationId and TimeSlotId = ts.Id and AssessmentDate = @CurrentDay and IsFriendRecommendation is null) as AssessmentCount,
case
when
EXISTS (
SELECT *
FROM OpeningHourOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
>=
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
<
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId
) THEN
(SELECT OverrideReason
FROM OpeningHourOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
>=
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
<
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId)
/*This doesn't seem right to me */
else ''
end as ClosureReason
from Timeslot ts
left join OpeningHour oh
on @locationId = oh.LocationId
and oh.DayOfWeek = DATEPART(dw, @CurrentDay)
where ts.StartTime >= oh.OpenTime
and ts.EndTime < oh.CloseTime
and datepart(minute,ts.StartTime) = 0
and CAST(ts.StartTime as DateTime) > @WindowTimeStart
) T WHERE TrialSlot = 1
AND AssessmentCount <AvailableSlots
And OpenStatus = 'Open'
AND TrialTimeAvailable = 1
order by
BookingDay,
StartTime
END
CTE例如SQL
declare @StartDate date = '2017-01-01'
declare @EndDate date = '2017-01-10'
;WITH cte AS (
SELECT @StartDate AS TrialDate
UNION ALL
SELECT DATEADD(day,1,TrialDate) as currentDate
FROM cte
WHERE DATEADD(day,1,TrialDate) <= @EndDate
)
感谢这个... SOR如果我不是100％清楚..我可以创建CTE没有问题，问题是我如何采取该CTE并将其应用于我目前只使用一个日期的查询？ –
@ChristopherPettigrew你是否希望运行你的存储过程N次？如果是这样，请将其转换为TVF并通过CROSS APPLY进行调用 –