Merging/splitting 优先日期范围重叠
Merging/splitting overlapping date ranges with priority
我有三个 table。一个 table 告诉我何时与特定供应商签订合同。第二个告诉我我们与所有供应商签订的基本费用表。第三个告诉我特定合同是否对其中一项费用有不同的合同费率。 table 看起来像这样:
CREATE TABLE [dbo].[Facility](
[FacilityID] [bigint] IDENTITY(1,1) NOT NULL,
[ProviderID] [varchar](50) NOT NULL,
[VendorID] [bigint] NOT NULL,
[FacilityName] [varchar](300) NOT NULL,
[FacilityAddress1] [varchar](300) NOT NULL,
[FacilityAddress2] [varchar](300) NOT NULL,
[FacilityCity] [varchar](300) NOT NULL,
[FacilityState] [char](2) NOT NULL,
[FacilityZip] [varchar](10) NOT NULL,
[ContractEffectiveDate] [date] NOT NULL,
[ContractTermDate] [date] NOT NULL,
CONSTRAINT [PK_Facility] PRIMARY KEY CLUSTERED
(
[FacilityID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[BaseFeeSchedule](
[BaseFeeScheduleID] [int] IDENTITY(1,1) NOT NULL,
[FeeCode] [varchar](10) NOT NULL,
[Description] [varchar](800) NOT NULL,
[Rate] [money] NOT NULL,
[CategoryID] [int] NOT NULL,
[RateEffectiveDate] [date] NOT NULL,
[RateTermDate] [date] NOT NULL,
CONSTRAINT [PK_BaseFeeSchedule] PRIMARY KEY CLUSTERED
(
[BaseFeeScheduleID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[OverrideFeeSchedule](
[OverrideFeeScheduleID] [bigint] IDENTITY(1,1) NOT NULL,
[FacilityID] [bigint] NOT NULL,
[FeeCode] [varchar](10) NOT NULL,
[OverrideRate] [money] NOT NULL,
[RateEffectiveDate] [date] NOT NULL,
[RateTermDate] [date] NOT NULL,
CONSTRAINT [PK_OverrideFeeSchedule] PRIMARY KEY CLUSTERED
(
[OverrideFeeScheduleID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[OverrideFeeSchedule] WITH CHECK ADD CONSTRAINT [FK_OverrideFeeSchedule_Facility] FOREIGN KEY([FacilityID])
REFERENCES [dbo].[Facility] ([FacilityID])
GO
ALTER TABLE [dbo].[OverrideFeeSchedule] CHECK CONSTRAINT [FK_OverrideFeeSchedule_Facility]
GO
我们现有的系统有一个 table,如下所示:
CREATE TABLE [dbo].[FeeSchedule](
[FeeScheduleID] [int] IDENTITY(1,1) NOT NULL,
[VendorID] [int] NULL,
[FeeCd] [varchar](10) NOT NULL,
[StartDate] [date] NOT NULL,
[EndDate] [date] NOT NULL,
[ContractedAmount] [money] NOT NULL,
[ProgramTypeID] [int] NULL,
CONSTRAINT [PK_FeeSchedule] PRIMARY KEY CLUSTERED
(
[FeeScheduleID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
代码中使用 table 来确定支付每个供应商的正确费率。保持 table 更新是我的工作,但事实证明这是有问题的,因为不同的设施在不同的日期签订合同。每份合同都包括基本费用表。但是,合同允许某些费用以不同的费用获得 "overridden"(在有折扣时通常低于正常的合同费用,在需要添加附加费时偶尔会更高)。这三个 table 是我构建的存储所有当前数据的,我一直在使用它们来构建软件所需的 FeeSchedule table。处理更改很容易,但我的任务是验证 FeeSchedule table 中的数据是否准确。
费用表 table 不仅包括新数据(这是我唯一更改的内容),还包括之前的数据。因此,计划是获取三个 table 中的数据,运行 合并日期范围的查询(其中 OverrideFeeSchedule table 中的费用优先于 BaseFeeSchedule 中的费用table)
这方面的一个例子:
INSERT INTO Facility(VendorID,ContractEffectiveDate,ContractTermDate,...)
VALUES(1,'1/1/2017','12/31/9999',...) --Assume FacilityID=1
INSERT INTO BaseFeeSchedule(FeeCode,Rate,RateEffectiveDate,RateTermDate,...)
VALUES('1',100,'1/1/2015','10/15/2016',...),
('1',120,'10/16/2016','4/5/2018',...),
('1',140,'4/6/2018','12/31/9999',...)
INSERT INTO OverrideFeeSchedule(FacilityID,FeeCode,OverrideRate,RateEffectiveDate,RateTermDate,...)
VALUES(1,'1',50,'3/1/2017','5/31/2018',...),
(1,'1',70,'7/1/2018','12/31/9999',...)
And from this data, I would want:
INSERT INTO FeeSchedule(VendorID, FeeCd, StartDate,EndDate,ContractedAmount)
VALUES(1,'1','1/1/2017','2/28/2017',120), --From BaseFeeSchedule
(1,'1','3/1/2017','5/31/2018',50), --From OverrideFeeSchedule
(1,'1','6/1/2018','6/30/2018',140), --From BaseFeeSchedule
(1,'1','7/1/2018','12/31/9999',70) --From OverrideFeeSchedule
我已验证重叠的 OverrideFeeSchedule table 中没有单个 Facility/FeeCode 组合的数据,并且重叠的 BaseFeeSchedule 中没有单个 FeeCode 的数据。我目前的解决方案需要永远。我正在执行以下操作:
建立一个 table 从第一个签约设施开始的每一天。 (BigTable 只是一个 table,有大约一百万条记录,我只需要足够的时间,这样我就可以得到从与供应商签订合同的第一个日期到从现在开始的一年之间的每一天。但是,由于最大递归大约20,000,当从第一个签约供应商到从今天开始的一年的范围超过20,000天时,我可能会因为违反最大递归而出错。所以,我希望有一个不同的解决方案。
SELECT DATEADD(DAY,ROW_NUMBER() OVER (ORDER BY A.TableID) - 1,B.MinDate) CheckDate
INTO #DatesToCheck
FROM BigTable A
CROSS JOIN
(SELECT MIN(ContractEffectiveDate) MinDate
FROM Facility) B
WHERE DATEADD(DAY,ROW_NUMBER() OVER (ORDER BY A.TableID) - 1,B.MinDate) < DATEADD(YEAR,1,GETDATE())
将这个 table 彼此 table 建立一个巨大的 table 每一天,那天签约的每一个设施,那天收费的每个 FeeCode ,以及当天的具体汇率。我不会为那个连接的代码费心,但它不难写。
接下来,我使用此处描述的技术合并日期范围:
Whosebug
虽然此技术有效,但速度极慢。有没有更直接的方法来生成我正在寻找的结果集?基本上,我正在寻找如何修改 link 中的方法,以考虑不同优先级(基础与覆盖)的潜在重叠,就像我提供的示例中那样。
我希望我没听错...
首先,你应该实现一个数字/日期table。这不是绝对必要的,但在许多情况下非常漂亮。你...
有了这样的列表,您可以尝试以下操作:
DECLARE @endDate DATE='20191231';
WITH DailyBaseRate AS
(
SELECT CoveredDays.CalendarDate
,CONCAT('base ',bfs.RateEffectiveDate) AS RateKey
,bfs.FeeCode
,bfs.Rate
FROM BaseFeeSchedule bfs
CROSS APPLY(SELECT * FROM RunningNumbers rn WHERE rn.CalendarDate<=@endDate AND rn.CalendarDate>=bfs.RateEffectiveDate AND rn.CalendarDate<=bfs.RateTermDate) CoveredDays
)
,OverrideRates AS
(
SELECT CoveredDays.CalendarDate
,o.FacilityID
,CONCAT('override ',o.RateEffectiveDate) AS RateKey
,o.FeeCode
,o.OverrideRate
FROM OverrideFeeSchedule o
CROSS APPLY(SELECT * FROM RunningNumbers rn WHERE rn.CalendarDate<=@endDate AND rn.CalendarDate>=o.RateEffectiveDate AND rn.CalendarDate<=o.RateTermDate) CoveredDays
)
,EffectiveRates AS
(
SELECT f.*
,dbr.CalendarDate
,COALESCE(ovr.RateKey, dbr.RateKey) AS EffectiveRateKey
,COALESCE(ovr.FeeCode, dbr.FeeCode) AS EffectiveFeeCode
,COALESCE(ovr.OverrideRate, dbr.Rate) AS EffectiveRate
FROM dbo.Facility f
CROSS JOIN DailyBaseRate dbr
LEFT JOIN OverrideRates ovr ON ovr.FacilityID=f.FacilityID AND ovr.CalendarDate=dbr.CalendarDate
WHERE dbr.CalendarDate<=@endDate
AND dbr.CalendarDate>=f.ContractEffectiveDate
AND dbr.CalendarDate<=f.ContractTermDate
)
SELECT FacilityID,FacilityName
,EffectiveRateKey,EffectiveFeeCode,EffectiveRate
,MIN(CalendarDate) AS FromDate
,MAX(CalendarDate) AS ToDate
FROM EffectiveRates
GROUP BY FacilityID,FacilityName,EffectiveRateKey,EffectiveFeeCode,EffectiveRate
ORDER BY FacilityID,FromDate;
结果(我已将第二个设施添加到您的测试数据...)
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| FacilityID | FacilityName | EffectiveRateKey | EffectiveFeeCode | EffectiveRate | FromDate | ToDate |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 1 | Fac1 | base 2016-10-16 | 1 | 120,00 | 2017-01-01 | 2017-02-28 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 1 | Fac1 | override 2017-03-01 | 1 | 50,00 | 2017-03-01 | 2018-05-31 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 1 | Fac1 | base 2018-04-06 | 1 | 140,00 | 2018-06-01 | 2018-06-30 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 1 | Fac1 | override 2018-07-01 | 1 | 50,00 | 2018-07-01 | 2019-12-31 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 2 | Fac2 | base 2018-04-06 | 1 | 140,00 | 2019-01-01 | 2019-12-31 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 2 | Fac2 | override 2019-07-01 | 1 | 99,00 | 2019-07-01 | 2019-08-15 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
简而言之
- 第一个 CTE 会将您的基本时间表转换为天数列表(每天一行,当前代码和费率)
- 第二个 CTE 将执行相同的操作,但使用覆盖计划
- 第三个 CTE 将 CROSS JOIN 您的设施与基本计划(如果有很多设施,这可能会变得相当大)并 LEFT JOIN 覆盖率(没有额外的行)
- 集合过滤到实际使用范围
- 最后我们可以按一些列进行分组,并选择具有 MIN 和 MAX 的区间边界
提示:我们需要 EffectiveRateKey
来避免 groupig 在一起 具有相同速率和代码的不同间隔。作为副作用,您可以看到,速率是从哪个来源获取的。
提示 2:因为我们永远不知道引擎将以何种顺序进行处理,请考虑索引,使用(索引)temp tables 而不是 CTE 可能会有很大帮助...
我有三个 table。一个 table 告诉我何时与特定供应商签订合同。第二个告诉我我们与所有供应商签订的基本费用表。第三个告诉我特定合同是否对其中一项费用有不同的合同费率。 table 看起来像这样:
CREATE TABLE [dbo].[Facility](
[FacilityID] [bigint] IDENTITY(1,1) NOT NULL,
[ProviderID] [varchar](50) NOT NULL,
[VendorID] [bigint] NOT NULL,
[FacilityName] [varchar](300) NOT NULL,
[FacilityAddress1] [varchar](300) NOT NULL,
[FacilityAddress2] [varchar](300) NOT NULL,
[FacilityCity] [varchar](300) NOT NULL,
[FacilityState] [char](2) NOT NULL,
[FacilityZip] [varchar](10) NOT NULL,
[ContractEffectiveDate] [date] NOT NULL,
[ContractTermDate] [date] NOT NULL,
CONSTRAINT [PK_Facility] PRIMARY KEY CLUSTERED
(
[FacilityID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[BaseFeeSchedule](
[BaseFeeScheduleID] [int] IDENTITY(1,1) NOT NULL,
[FeeCode] [varchar](10) NOT NULL,
[Description] [varchar](800) NOT NULL,
[Rate] [money] NOT NULL,
[CategoryID] [int] NOT NULL,
[RateEffectiveDate] [date] NOT NULL,
[RateTermDate] [date] NOT NULL,
CONSTRAINT [PK_BaseFeeSchedule] PRIMARY KEY CLUSTERED
(
[BaseFeeScheduleID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[OverrideFeeSchedule](
[OverrideFeeScheduleID] [bigint] IDENTITY(1,1) NOT NULL,
[FacilityID] [bigint] NOT NULL,
[FeeCode] [varchar](10) NOT NULL,
[OverrideRate] [money] NOT NULL,
[RateEffectiveDate] [date] NOT NULL,
[RateTermDate] [date] NOT NULL,
CONSTRAINT [PK_OverrideFeeSchedule] PRIMARY KEY CLUSTERED
(
[OverrideFeeScheduleID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[OverrideFeeSchedule] WITH CHECK ADD CONSTRAINT [FK_OverrideFeeSchedule_Facility] FOREIGN KEY([FacilityID])
REFERENCES [dbo].[Facility] ([FacilityID])
GO
ALTER TABLE [dbo].[OverrideFeeSchedule] CHECK CONSTRAINT [FK_OverrideFeeSchedule_Facility]
GO
我们现有的系统有一个 table,如下所示:
CREATE TABLE [dbo].[FeeSchedule](
[FeeScheduleID] [int] IDENTITY(1,1) NOT NULL,
[VendorID] [int] NULL,
[FeeCd] [varchar](10) NOT NULL,
[StartDate] [date] NOT NULL,
[EndDate] [date] NOT NULL,
[ContractedAmount] [money] NOT NULL,
[ProgramTypeID] [int] NULL,
CONSTRAINT [PK_FeeSchedule] PRIMARY KEY CLUSTERED
(
[FeeScheduleID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
代码中使用 table 来确定支付每个供应商的正确费率。保持 table 更新是我的工作,但事实证明这是有问题的,因为不同的设施在不同的日期签订合同。每份合同都包括基本费用表。但是,合同允许某些费用以不同的费用获得 "overridden"(在有折扣时通常低于正常的合同费用,在需要添加附加费时偶尔会更高)。这三个 table 是我构建的存储所有当前数据的,我一直在使用它们来构建软件所需的 FeeSchedule table。处理更改很容易,但我的任务是验证 FeeSchedule table 中的数据是否准确。
费用表 table 不仅包括新数据(这是我唯一更改的内容),还包括之前的数据。因此,计划是获取三个 table 中的数据,运行 合并日期范围的查询(其中 OverrideFeeSchedule table 中的费用优先于 BaseFeeSchedule 中的费用table)
这方面的一个例子:
INSERT INTO Facility(VendorID,ContractEffectiveDate,ContractTermDate,...)
VALUES(1,'1/1/2017','12/31/9999',...) --Assume FacilityID=1
INSERT INTO BaseFeeSchedule(FeeCode,Rate,RateEffectiveDate,RateTermDate,...)
VALUES('1',100,'1/1/2015','10/15/2016',...),
('1',120,'10/16/2016','4/5/2018',...),
('1',140,'4/6/2018','12/31/9999',...)
INSERT INTO OverrideFeeSchedule(FacilityID,FeeCode,OverrideRate,RateEffectiveDate,RateTermDate,...)
VALUES(1,'1',50,'3/1/2017','5/31/2018',...),
(1,'1',70,'7/1/2018','12/31/9999',...)
And from this data, I would want:
INSERT INTO FeeSchedule(VendorID, FeeCd, StartDate,EndDate,ContractedAmount)
VALUES(1,'1','1/1/2017','2/28/2017',120), --From BaseFeeSchedule
(1,'1','3/1/2017','5/31/2018',50), --From OverrideFeeSchedule
(1,'1','6/1/2018','6/30/2018',140), --From BaseFeeSchedule
(1,'1','7/1/2018','12/31/9999',70) --From OverrideFeeSchedule
我已验证重叠的 OverrideFeeSchedule table 中没有单个 Facility/FeeCode 组合的数据,并且重叠的 BaseFeeSchedule 中没有单个 FeeCode 的数据。我目前的解决方案需要永远。我正在执行以下操作:
建立一个 table 从第一个签约设施开始的每一天。 (BigTable 只是一个 table,有大约一百万条记录,我只需要足够的时间,这样我就可以得到从与供应商签订合同的第一个日期到从现在开始的一年之间的每一天。但是,由于最大递归大约20,000,当从第一个签约供应商到从今天开始的一年的范围超过20,000天时,我可能会因为违反最大递归而出错。所以,我希望有一个不同的解决方案。
SELECT DATEADD(DAY,ROW_NUMBER() OVER (ORDER BY A.TableID) - 1,B.MinDate) CheckDate
INTO #DatesToCheck
FROM BigTable A
CROSS JOIN
(SELECT MIN(ContractEffectiveDate) MinDate
FROM Facility) B
WHERE DATEADD(DAY,ROW_NUMBER() OVER (ORDER BY A.TableID) - 1,B.MinDate) < DATEADD(YEAR,1,GETDATE())
将这个 table 彼此 table 建立一个巨大的 table 每一天,那天签约的每一个设施,那天收费的每个 FeeCode ,以及当天的具体汇率。我不会为那个连接的代码费心,但它不难写。
接下来,我使用此处描述的技术合并日期范围: Whosebug
虽然此技术有效,但速度极慢。有没有更直接的方法来生成我正在寻找的结果集?基本上,我正在寻找如何修改 link 中的方法,以考虑不同优先级(基础与覆盖)的潜在重叠,就像我提供的示例中那样。
我希望我没听错...
首先,你应该实现一个数字/日期table。这不是绝对必要的,但在许多情况下非常漂亮。你
有了这样的列表,您可以尝试以下操作:
DECLARE @endDate DATE='20191231';
WITH DailyBaseRate AS
(
SELECT CoveredDays.CalendarDate
,CONCAT('base ',bfs.RateEffectiveDate) AS RateKey
,bfs.FeeCode
,bfs.Rate
FROM BaseFeeSchedule bfs
CROSS APPLY(SELECT * FROM RunningNumbers rn WHERE rn.CalendarDate<=@endDate AND rn.CalendarDate>=bfs.RateEffectiveDate AND rn.CalendarDate<=bfs.RateTermDate) CoveredDays
)
,OverrideRates AS
(
SELECT CoveredDays.CalendarDate
,o.FacilityID
,CONCAT('override ',o.RateEffectiveDate) AS RateKey
,o.FeeCode
,o.OverrideRate
FROM OverrideFeeSchedule o
CROSS APPLY(SELECT * FROM RunningNumbers rn WHERE rn.CalendarDate<=@endDate AND rn.CalendarDate>=o.RateEffectiveDate AND rn.CalendarDate<=o.RateTermDate) CoveredDays
)
,EffectiveRates AS
(
SELECT f.*
,dbr.CalendarDate
,COALESCE(ovr.RateKey, dbr.RateKey) AS EffectiveRateKey
,COALESCE(ovr.FeeCode, dbr.FeeCode) AS EffectiveFeeCode
,COALESCE(ovr.OverrideRate, dbr.Rate) AS EffectiveRate
FROM dbo.Facility f
CROSS JOIN DailyBaseRate dbr
LEFT JOIN OverrideRates ovr ON ovr.FacilityID=f.FacilityID AND ovr.CalendarDate=dbr.CalendarDate
WHERE dbr.CalendarDate<=@endDate
AND dbr.CalendarDate>=f.ContractEffectiveDate
AND dbr.CalendarDate<=f.ContractTermDate
)
SELECT FacilityID,FacilityName
,EffectiveRateKey,EffectiveFeeCode,EffectiveRate
,MIN(CalendarDate) AS FromDate
,MAX(CalendarDate) AS ToDate
FROM EffectiveRates
GROUP BY FacilityID,FacilityName,EffectiveRateKey,EffectiveFeeCode,EffectiveRate
ORDER BY FacilityID,FromDate;
结果(我已将第二个设施添加到您的测试数据...)
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| FacilityID | FacilityName | EffectiveRateKey | EffectiveFeeCode | EffectiveRate | FromDate | ToDate |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 1 | Fac1 | base 2016-10-16 | 1 | 120,00 | 2017-01-01 | 2017-02-28 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 1 | Fac1 | override 2017-03-01 | 1 | 50,00 | 2017-03-01 | 2018-05-31 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 1 | Fac1 | base 2018-04-06 | 1 | 140,00 | 2018-06-01 | 2018-06-30 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 1 | Fac1 | override 2018-07-01 | 1 | 50,00 | 2018-07-01 | 2019-12-31 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 2 | Fac2 | base 2018-04-06 | 1 | 140,00 | 2019-01-01 | 2019-12-31 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
| 2 | Fac2 | override 2019-07-01 | 1 | 99,00 | 2019-07-01 | 2019-08-15 |
+------------+--------------+---------------------+------------------+---------------+------------+------------+
简而言之
- 第一个 CTE 会将您的基本时间表转换为天数列表(每天一行,当前代码和费率)
- 第二个 CTE 将执行相同的操作,但使用覆盖计划
- 第三个 CTE 将 CROSS JOIN 您的设施与基本计划(如果有很多设施,这可能会变得相当大)并 LEFT JOIN 覆盖率(没有额外的行)
- 集合过滤到实际使用范围
- 最后我们可以按一些列进行分组,并选择具有 MIN 和 MAX 的区间边界
提示:我们需要 EffectiveRateKey
来避免 groupig 在一起 具有相同速率和代码的不同间隔。作为副作用,您可以看到,速率是从哪个来源获取的。
提示 2:因为我们永远不知道引擎将以何种顺序进行处理,请考虑索引,使用(索引)temp tables 而不是 CTE 可能会有很大帮助...