SQL Server中带where子句的透视
我需要在SQL中使用Pivot来转换列中的行,但我的Pivot查询无法这样做SQL Server中带where子句的透视,sql,sql-server,sql-server-2008,pivot,Sql,Sql Server,Sql Server 2008,Pivot,我需要在SQL中使用Pivot来转换列中的行,但我的Pivot查询无法这样做 create table TestTable ( id int, colVal int ) insert into TestTable values(1,1) insert into TestTable values(1,2) insert into TestTable values(1,4) insert into TestTable values(2,1) inse
create table TestTable
(
id int,
colVal int
)
insert into TestTable values(1,1)
insert into TestTable values(1,2)
insert into TestTable values(1,4)
insert into TestTable values(2,1)
insert into TestTable values(2,2)
insert into TestTable values(2,6)
我试图根据下面的查询where子句获取列中colVal的值
select * from
(
Select ID,colVal
from TestTable
where ID=1
) as PV
pivot
(max(id) for colVal in([1], [2], [3])) piv
对于每个ID,只能有3个colvalue,因此我在pivot中指定了[1]、[2]、[3]
I am looking for output like
ID c1 c2 c3
1 1 2 4
有人能帮我吗。只需使用Row\u Number()创建列序列
select id,[1] as c1,[2] as c2,[3] as c3 from
(
Select ID
,col = row_number() over (Partition By ID Order by colVal)
,colVal
from TestTable
where ID=1
) as PV
pivot
(max(colVal) for col in([1], [2], [3])) piv
返回
ID c1 c2 c3
1 1 2 4
编辑-动态版本
为2008年编辑
这真是太棒了!!!如果您能在下面的查询中解释我,我将非常高兴:
col=row_number()(按ID划分,按colVal排序)
还有一件事,如果“每个ID只能有3个colValues”发生更改怎么办。那么,我应该在透视列列表中进行更改吗?@Abhishek_Chourasia窗口函数非常有用,值得您花时间熟悉它们,如果您运行子查询(带或不带WHERE),您将看到列增量为1。现在,它将成为pivot@Abhishek_Chourasia如果列数增加。。。两种选择。1) 只需在轴上添加更多的列,或者2)您将需要动态。。稍后,我将发布一个动态版本“CONCAT”,在查询中给出一个错误,表示它不是内置函数名。我正在使用SQL2008R0。
Declare @SQL varchar(max) = Stuff((Select Distinct ',' + QuoteName(concat('C',row_number() over (Partition By ID Order by colVal)))
From TestTable
Order By 1
For XML Path('')
),1,1,'')
Select @SQL = '
Select [id],' + @SQL + '
From (
Select ID
,col = concat(''C'',row_number() over (Partition By ID Order by colVal))
,colVal
from TestTable
where ID=1
) A
Pivot (max(colVal) For [col] in (' + @SQL + ') ) p'
Exec(@SQL);
Declare @SQL varchar(max) = Stuff((Select Distinct ',' + QuoteName('C'+cast(row_number() over (Partition By ID Order by colVal) as varchar(10)))
From TestTable
Order By 1
For XML Path('')
),1,1,'')
Select @SQL = '
Select [id],' + @SQL + '
From (
Select ID
,col = ''C''+cast(row_number() over (Partition By ID Order by colVal) as varchar(10))
,colVal
from TestTable
where ID=1
) A
Pivot (max(colVal) For [col] in (' + @SQL + ') ) p'
Exec(@SQL);