SQL 多个列上的服务器 PIVOT 正在丢失数据
SQL Server PIVOT on multiple columns is losing data
我在这个问题上花了太多时间，我还没有走到终点。在您 运行 得出结论之前，请通读此内容，即这是 SO 上具有多列的所有其他数据透视表的副本。
我们有属性和单位，其中有一个 table 可以跟踪单位何时发生变化。我们无法更改 table 的结构，因为这是供应商应用程序。
Objective：提取单位代码不可用时的开始和结束日期"model"。
问题：我需要过滤掉中间可用的日期，尽管这似乎每次都省略了一行数据（对于单元 105）。
我试过的：PIVOT, CROSS APPLY 结合 LEAD/LAG
这是 SQLFiddle 的 link：http://sqlfiddle.com/#!6/29592/2/0
问题的其余部分有来自 SQLfiddle 的 tsql，包括我得到的结果。想要的结果在最后。
创建table并插入示例数据
DROP TABLE IF EXISTS testModelUnit;
CREATE TABLE testModelUnit(
propertykey INT NOT NULL
,unitNumber VARCHAR(10) NOT NULL
,rowStartDate DATETIME NOT NULL
,rowEndDate DATETIME NOT NULL
,unavailableCode varchar(10) NULL
,CONSTRAINT pk_testModelUnit PRIMARY KEY (propertykey, unitNumber, rowStartDate )
)
GO
INSERT INTO testModelUnit VALUES
(33,'105', '2010-11-11 00:00:00.000','2016-11-11 00:00:00.000','MODEL')
,(33,'105', '2016-11-11 00:00:00.000','2016-12-14 07:51:03.307','MODEL')
,(33,'105', '2016-12-14 07:51:03.307','2017-01-01 00:00:00.000',NULL)
,(33,'105', '2017-01-01 00:00:00.00','2017-03-21 12:21:13.703','MODEL')
,(33,'105', '2017-03-21 12:21:13.703','2017-04-21 12:21:13.703','MODEL')
,(33,'105', '2017-04-21 12:21:13.703','9999-12-31 00:00:00.000','MODEL')
,(33,'2606','2017-04-21 12:21:23.207','9999-12-31 00:00:00.000','MODEL')
,(33,'2606','2017-04-19 10:30:09.227','2017-04-21 12:21:23.207','MODEL')
,(33,'2703','2016-12-14 07:51:03.307','2017-04-19 10:29:47.970','MODEL')
,(33,'2703','2011-11-11 00:00:00.000','2016-12-14 07:51:03.307','MODEL')
GO
这为您提供了测试它所需的所有数据，因为 105 单元在 2016 年底的短时间内可用。
尝试 1 - 使用 LEAD/LAG 确定日期是否是系列中的第一个日期 - 然后使用多个 PIVOT 语句
SELECT
propertykey
,unitNumber
,firstDate
,lastDate
FROM (
SELECT
propertykey
,unitNumber
,rowStartDate
,rowEndDate
,CASE
WHEN propertykey = LAG(propertykey,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND unitNumber = LAG(unitNumber,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND LAG(rowEndDate,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate) = rowStartDate THEN NULL
ELSE 'firstDate'
END ISFIRST
,CASE
WHEN propertykey = LEAD(propertykey,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND unitNumber = LEAD(unitNumber,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND LEAD(rowStartDate,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate) = rowEndDate THEN NULL
ELSE 'lastDate'
END ISLAST
FROM testModelUnit
WHERE UnavailableCode = 'model'
) SRC
PIVOT (
MAX(rowStartDate)
FOR isfirst in ([firstDate])
) as pivotFirst
PIVOT (
MAX(rowEndDate)
FOR islast in ([lastDate])
) as pivotLast
结果是：
propertykey unitNumber firstDate lastDate
33 105 NULL 9999-12-31 00:00:00.000
33 105 2010-11-11 00:00:00.000 NULL
33 105 2017-01-01 00:00:00.000 NULL
33 2606 NULL 9999-12-31 00:00:00.000
33 2606 2017-04-19 10:30:09.227 NULL
33 2703 NULL 2017-04-19 10:29:47.970
33 2703 2011-11-11 00:00:00.000 NULL
问题是双重的：首先，我在不同的行中有 NULL，其次，我缺少单元 105 的结束日期（通过颠倒两个数据透视语句的顺序，我扭转了问题，我是然后在开始日期丢失）
第二次尝试：像以前一样使用 LAG/LEAD，但这次使用 CROSS APPLY 将 first/last 值放入一列，然后旋转结果
SELECT
propertykey
,unitNumber
,firstDate
,lastDate
FROM(
SELECT
propertykey
,unitNumber
,ca.col
,ca.value
FROM
(
SELECT
propertykey
,unitNumber
,rowStartDate
,rowEndDate
,CASE
WHEN propertykey = LAG(propertykey,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND unitNumber = LAG(unitNumber,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND LAG(rowEndDate,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate) = rowStartDate THEN NULL
ELSE 'firstDate'
END ISFIRST
,CASE
WHEN propertykey = LEAD(propertykey,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND unitNumber = LEAD(unitNumber,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND LEAD(rowStartDate,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate) = rowEndDate THEN NULL
ELSE 'lastDate'
END ISLAST
FROM testModelUnit
WHERE UnavailableCode = 'model'
) sub
OUTER APPLY (
SELECT ISFIRST, rowStartDate
UNION ALL
SELECT ISLAST, rowEndDate
) CA (col, value)
WHERE col IS NOT NULL
)src
PIVOT
(
max(value)
for col in ([firstDate],[lastDate])
) AS pivoted
结果：
propertykey unitNumber firstDate lastDate
33 105 2017-01-01 00:00:00.000 9999-12-31 00:00:00.000
33 2606 2017-04-19 10:30:09.227 9999-12-31 00:00:00.000
33 2703 2011-11-11 00:00:00.000 2017-04-19 10:29:47.970
问题：我去掉了 NULL 行，但仍然缺少 105 的一条数据记录
想要的结果：
propertykey unitNumber firstDate lastDate
33 105 2010-11-11 00:00:00.000 2016-12-14 07:51:03.307
33 105 2017-01-01 00:00:00.000 9999-12-31 00:00:00.000
33 2606 2017-04-19 10:30:09.227 9999-12-31 00:00:00.000
33 2703 2011-11-11 00:00:00.000 2017-04-19 10:29:47.970
您正在寻找如下查询吗？
Select PropertyKey, UnitNumber, Min(RowStartDate) as FirstDate, Max(rowEndDate) as LastDate from (
Select *, Bucket = Row_number() over(partition by propertykey, unitnumber order by rowStartDate) -
Row_number() over(partition by propertykey, unitnumber, unavailablecode order by rowStartDate)
from testModelUnit
) a
Where a.unavailableCode is not null
group by propertykey, unitNumber, Bucket
输出如下：
+-------------+------------+-------------------------+-------------------------+
| PropertyKey | UnitNumber | FirstDate | LastDate |
+-------------+------------+-------------------------+-------------------------+
| 33 | 105 | 2010-11-11 00:00:00.000 | 2016-12-14 07:51:03.307 |
| 33 | 105 | 2017-01-01 00:00:00.000 | 9999-12-31 00:00:00.000 |
| 33 | 2606 | 2017-04-19 10:30:09.227 | 9999-12-31 00:00:00.000 |
| 33 | 2703 | 2011-11-11 00:00:00.000 | 2017-04-19 10:29:47.970 |
+-------------+------------+-------------------------+-------------------------+
我在这个问题上花了太多时间，我还没有走到终点。在您 运行 得出结论之前，请通读此内容，即这是 SO 上具有多列的所有其他数据透视表的副本。
我们有属性和单位，其中有一个 table 可以跟踪单位何时发生变化。我们无法更改 table 的结构，因为这是供应商应用程序。
Objective：提取单位代码不可用时的开始和结束日期"model"。
问题：我需要过滤掉中间可用的日期，尽管这似乎每次都省略了一行数据（对于单元 105）。
我试过的：PIVOT, CROSS APPLY 结合 LEAD/LAG
这是 SQLFiddle 的 link：http://sqlfiddle.com/#!6/29592/2/0
问题的其余部分有来自 SQLfiddle 的 tsql，包括我得到的结果。想要的结果在最后。
创建table并插入示例数据
DROP TABLE IF EXISTS testModelUnit;
CREATE TABLE testModelUnit(
propertykey INT NOT NULL
,unitNumber VARCHAR(10) NOT NULL
,rowStartDate DATETIME NOT NULL
,rowEndDate DATETIME NOT NULL
,unavailableCode varchar(10) NULL
,CONSTRAINT pk_testModelUnit PRIMARY KEY (propertykey, unitNumber, rowStartDate )
)
GO
INSERT INTO testModelUnit VALUES
(33,'105', '2010-11-11 00:00:00.000','2016-11-11 00:00:00.000','MODEL')
,(33,'105', '2016-11-11 00:00:00.000','2016-12-14 07:51:03.307','MODEL')
,(33,'105', '2016-12-14 07:51:03.307','2017-01-01 00:00:00.000',NULL)
,(33,'105', '2017-01-01 00:00:00.00','2017-03-21 12:21:13.703','MODEL')
,(33,'105', '2017-03-21 12:21:13.703','2017-04-21 12:21:13.703','MODEL')
,(33,'105', '2017-04-21 12:21:13.703','9999-12-31 00:00:00.000','MODEL')
,(33,'2606','2017-04-21 12:21:23.207','9999-12-31 00:00:00.000','MODEL')
,(33,'2606','2017-04-19 10:30:09.227','2017-04-21 12:21:23.207','MODEL')
,(33,'2703','2016-12-14 07:51:03.307','2017-04-19 10:29:47.970','MODEL')
,(33,'2703','2011-11-11 00:00:00.000','2016-12-14 07:51:03.307','MODEL')
GO
这为您提供了测试它所需的所有数据，因为 105 单元在 2016 年底的短时间内可用。
尝试 1 - 使用 LEAD/LAG 确定日期是否是系列中的第一个日期 - 然后使用多个 PIVOT 语句
SELECT
propertykey
,unitNumber
,firstDate
,lastDate
FROM (
SELECT
propertykey
,unitNumber
,rowStartDate
,rowEndDate
,CASE
WHEN propertykey = LAG(propertykey,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND unitNumber = LAG(unitNumber,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND LAG(rowEndDate,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate) = rowStartDate THEN NULL
ELSE 'firstDate'
END ISFIRST
,CASE
WHEN propertykey = LEAD(propertykey,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND unitNumber = LEAD(unitNumber,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND LEAD(rowStartDate,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate) = rowEndDate THEN NULL
ELSE 'lastDate'
END ISLAST
FROM testModelUnit
WHERE UnavailableCode = 'model'
) SRC
PIVOT (
MAX(rowStartDate)
FOR isfirst in ([firstDate])
) as pivotFirst
PIVOT (
MAX(rowEndDate)
FOR islast in ([lastDate])
) as pivotLast
结果是：
propertykey unitNumber firstDate lastDate
33 105 NULL 9999-12-31 00:00:00.000
33 105 2010-11-11 00:00:00.000 NULL
33 105 2017-01-01 00:00:00.000 NULL
33 2606 NULL 9999-12-31 00:00:00.000
33 2606 2017-04-19 10:30:09.227 NULL
33 2703 NULL 2017-04-19 10:29:47.970
33 2703 2011-11-11 00:00:00.000 NULL
问题是双重的：首先，我在不同的行中有 NULL，其次，我缺少单元 105 的结束日期（通过颠倒两个数据透视语句的顺序，我扭转了问题，我是然后在开始日期丢失）
第二次尝试：像以前一样使用 LAG/LEAD，但这次使用 CROSS APPLY 将 first/last 值放入一列，然后旋转结果
SELECT
propertykey
,unitNumber
,firstDate
,lastDate
FROM(
SELECT
propertykey
,unitNumber
,ca.col
,ca.value
FROM
(
SELECT
propertykey
,unitNumber
,rowStartDate
,rowEndDate
,CASE
WHEN propertykey = LAG(propertykey,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND unitNumber = LAG(unitNumber,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND LAG(rowEndDate,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate) = rowStartDate THEN NULL
ELSE 'firstDate'
END ISFIRST
,CASE
WHEN propertykey = LEAD(propertykey,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND unitNumber = LEAD(unitNumber,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate)
AND LEAD(rowStartDate,1,NULL) OVER (PARTITION BY propertykey,unitNumber ORDER BY rowStartDate) = rowEndDate THEN NULL
ELSE 'lastDate'
END ISLAST
FROM testModelUnit
WHERE UnavailableCode = 'model'
) sub
OUTER APPLY (
SELECT ISFIRST, rowStartDate
UNION ALL
SELECT ISLAST, rowEndDate
) CA (col, value)
WHERE col IS NOT NULL
)src
PIVOT
(
max(value)
for col in ([firstDate],[lastDate])
) AS pivoted
结果：
propertykey unitNumber firstDate lastDate
33 105 2017-01-01 00:00:00.000 9999-12-31 00:00:00.000
33 2606 2017-04-19 10:30:09.227 9999-12-31 00:00:00.000
33 2703 2011-11-11 00:00:00.000 2017-04-19 10:29:47.970
问题：我去掉了 NULL 行，但仍然缺少 105 的一条数据记录
想要的结果：
propertykey unitNumber firstDate lastDate
33 105 2010-11-11 00:00:00.000 2016-12-14 07:51:03.307
33 105 2017-01-01 00:00:00.000 9999-12-31 00:00:00.000
33 2606 2017-04-19 10:30:09.227 9999-12-31 00:00:00.000
33 2703 2011-11-11 00:00:00.000 2017-04-19 10:29:47.970
您正在寻找如下查询吗？
Select PropertyKey, UnitNumber, Min(RowStartDate) as FirstDate, Max(rowEndDate) as LastDate from (
Select *, Bucket = Row_number() over(partition by propertykey, unitnumber order by rowStartDate) -
Row_number() over(partition by propertykey, unitnumber, unavailablecode order by rowStartDate)
from testModelUnit
) a
Where a.unavailableCode is not null
group by propertykey, unitNumber, Bucket
输出如下：
+-------------+------------+-------------------------+-------------------------+
| PropertyKey | UnitNumber | FirstDate | LastDate |
+-------------+------------+-------------------------+-------------------------+
| 33 | 105 | 2010-11-11 00:00:00.000 | 2016-12-14 07:51:03.307 |
| 33 | 105 | 2017-01-01 00:00:00.000 | 9999-12-31 00:00:00.000 |
| 33 | 2606 | 2017-04-19 10:30:09.227 | 9999-12-31 00:00:00.000 |
| 33 | 2703 | 2011-11-11 00:00:00.000 | 2017-04-19 10:29:47.970 |
+-------------+------------+-------------------------+-------------------------+