Sql server 2008 不知道如何做到这一点;合并“;T-SQL中的类型查询
我有如下原始数据: 我想执行一个T-SQL查询,将数据以以下形式显示: 这几乎像是一个UnPivot类型的查询,但我不知道如何去做。还有一点需要澄清。LastModifiedTime列的值可以是每个子ID的五个值中的任意一个。到底是哪一个并不重要 非常感谢你的帮助Sql server 2008 不知道如何做到这一点;合并“;T-SQL中的类型查询,sql-server-2008,tsql,Sql Server 2008,Tsql,我有如下原始数据: 我想执行一个T-SQL查询,将数据以以下形式显示: 这几乎像是一个UnPivot类型的查询,但我不知道如何去做。还有一点需要澄清。LastModifiedTime列的值可以是每个子ID的五个值中的任意一个。到底是哪一个并不重要 非常感谢你的帮助 select * from ( select subgroupid, coater, metrictypedescription, subgroupvalue, valuedescription from myt
select * from
(
select subgroupid, coater, metrictypedescription, subgroupvalue, valuedescription
from mytable
) data
PIVOT(
sum(subgroupvalue)
FOR valuedescription IN ([Average],[Minimum],[Maximum],[Standard Deviation],[xWebRange])
) TOTALS
-
可以是任何聚合函数,因为每个函数只有一个值,这真的不重要
产生这个
编辑:
如果您确实需要最后一个修改的列,那么您需要像BlueFoots那样在子查询中添加联接。有两种方法可以做到这一点,或者使用静态透视,在其中硬编码需要透视的值:
create table temp
(
subgroupid int,
coater varchar(10),
metricTypeDescriptor varchar(5),
subgroupvalue decimal(20, 6),
valuedescription varchar(50),
lastmodfiedtime datetime
)
insert into temp values(28099, 'VA_A', 'CdSim', 2.99886, 'Average', '2012-05-03 20:55:02.14')
insert into temp values(28099, 'VA_A', 'CdSim', 2.57201, 'Minimum', '2012-05-03 20:55:02.14')
insert into temp values(28099, 'VA_A', 'CdSim', 3.1646, 'Maximum', '2012-05-03 20:55:02.143')
insert into temp values(28099, 'VA_A', 'CdSim', 0.22082, 'Standard Deviation', '2012-05-03 20:55:02.153')
insert into temp values(28099, 'VA_A', 'CdSim', 0.59259, 'xWebRange', '2012-05-03 20:55:02.157')
insert into temp values(28102, 'VA_A', 'CdSim', 2.9091, 'Average', '2012-05-03 21:00:01.27')
insert into temp values(28102, 'VA_A', 'CdSim', 2.67619, 'Minimum', '2012-05-03 21:00:01.27')
insert into temp values(28102, 'VA_A', 'CdSim', 3.17471, 'Maximum', '2012-05-03 21:00:01.27')
insert into temp values(28102, 'VA_A', 'CdSim', 0.191868, 'Standard Deviation', '2012-05-03 21:00:01.27')
insert into temp values(28102, 'VA_A', 'CdSim', 0.49852, 'xWebRange', '2012-05-03 21:00:01.27')
insert into temp values(28104, 'VA_A', 'CdSim', 3.05835, 'Average', '2012-05-03 21:05:01.383')
insert into temp values(28104, 'VA_A', 'CdSim', 2.80336, 'Minimum', '2012-05-03 21:05:01.387')
insert into temp values(28104, 'VA_A', 'CdSim', 3.17943, 'Maximum', '2012-05-03 21:05:01.387')
insert into temp values(28104, 'VA_A', 'CdSim', 0.158743, 'Standard Deviation', '2012-05-03 21:05:01.39')
insert into temp values(28104, 'VA_A', 'CdSim', 0.37607, 'xWebRange', '2012-05-03 21:05:01.40')
select subgroupid, coater, metrictypedescriptor
, [average]
, [maximum]
, [minimum]
, [standard deviation]
, lastmodfiedtime
from
(
select t1.subgroupid, t1.coater, t1.metrictypedescriptor, t1.valuedescription, t1.subgroupvalue, t2.lastmodfiedtime
from temp t1
left join
(
select subgroupid, max(lastmodfiedtime) as lastmodfiedtime
from temp
group by subgroupid
) t2
on t1.subgroupid = t2.subgroupid
) x
pivot
(
max(subgroupvalue)
for valuedescription in([Average], [Minimum], [Maximum], [Standard Deviation])
) p
drop table temp
或者,您可以通过动态透视来实现这一点,在动态透视中,您可以动态创建列列表,然后透视它们:
DECLARE @cols AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX);
select @cols = STUFF((SELECT distinct ',' + QUOTENAME(c.valuedescription)
FROM temp c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = 'SELECT subgroupid, coater, metrictypedescriptor, ' + @cols + ', lastmodfiedtime from
(
select t1.subgroupid, t1.coater, t1.metrictypedescriptor, t1.valuedescription, t1.subgroupvalue, t2.lastmodfiedtime
from temp t1
left join
(
select subgroupid, max(lastmodfiedtime) as lastmodfiedtime
from temp
group by subgroupid
) t2
on t1.subgroupid = t2.subgroupid
) x
pivot
(
max(subgroupvalue)
for valuedescription in(' + @cols + ')
) p '
execute(@query)
实际上,不需要使用
PIVOT
,就可以相当轻松地完成这一任务。其思想是使用MAX
和case语句从分组中选择行并将它们转换为列。您的groupby
是您希望返回的所有列,这些列在整个组中都是一致的
SELECT SubGroupId, Coater, MetricTypeDescriptor,
MAX(CASE WHEN ValueDescription = 'Average'
THEN SubGroupValue END) as Average,
MAX(CASE WHEN ValueDescription = 'Minimum'
THEN SubGroupValue END) as Minimum,
MAX(CASE WHEN ValueDescription = 'Maximum'
THEN SubGroupValue END) as Maximum,
MAX(CASE WHEN ValueDescription = 'Standard Deviation'
THEN SubGroupValue END) as "Standard Deviation",
MAX(LastModifiedTime) as LastModifiedTime
FROM YourTable
GROUP BY SubGroupId, Coater, MetricTypeDescriptor
看不到您的帖子中包含的图片。您可以在SQL 2008中执行该操作。@David-稍等几秒钟-它们很慢,但确实会出现。
SELECT SubGroupId, Coater, MetricTypeDescriptor,
MAX(CASE WHEN ValueDescription = 'Average'
THEN SubGroupValue END) as Average,
MAX(CASE WHEN ValueDescription = 'Minimum'
THEN SubGroupValue END) as Minimum,
MAX(CASE WHEN ValueDescription = 'Maximum'
THEN SubGroupValue END) as Maximum,
MAX(CASE WHEN ValueDescription = 'Standard Deviation'
THEN SubGroupValue END) as "Standard Deviation",
MAX(LastModifiedTime) as LastModifiedTime
FROM YourTable
GROUP BY SubGroupId, Coater, MetricTypeDescriptor