SQL复杂动态数据透视2 [英] SQL complex dynamic Pivoting 2
问题描述
我正在SQL Server中尝试下表的透视图
Hi I am trying in SQL Server the pivoting for the following table
REFID | COL1 | COL2 | Sequence
1 abc cde 1
1 lmn rst 2
1 kna asg 3
2 als zkd 2
2 zpk lad 1
我希望输出为
REFID | 1COL1 | 2COL1 | 3COL1 |1COL2|2COL2|3COL2
1 abc lmn kna cde rst asg
2 zpk als null lad zkd null
原始表中的列数是已知的,但是行数是未知的.谁能帮忙
The number of columns in the original table are known but the number of rows are not known. Can any one help
推荐答案
如果您想将sequence
数字作为列名的一部分包含在内,那么您仍然需要取消对col1
和col2
列的透视首先,然后应用枢轴.区别在于,您将sequence
编号连接到在取消透视过程中创建的列名.
If you want to include the sequence
number as part of your column names, then you will still need to unpivot your col1
and col2
columns first, then apply the pivot. The difference is that you will concatenate the sequence
number to your column names created during the unpivot process.
对于已知数量的值,查询将为:
For a known number of values the query would be:
select REFID,
[1col1], [2col1], [3col1],
[1col2], [2col2], [3col2]
from
(
select REFID,
col = cast(Sequence as varchar(10))+ col, value
from yourtable
cross apply
(
select 'COL1', col1 union all
select 'COL2', col2
) c (col, value)
) d
pivot
(
max(value)
for col in ([1col1], [2col1], [3col1],
[1col2], [2col2], [3col2])
) piv
order by refid;
然后,如果您的数字未知,则动态SQL版本将为:
Then if you have an unknown number the dynamic SQL version will be:
DECLARE @cols AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX)
select @cols = STUFF((SELECT ',' + QUOTENAME(cast(Sequence as varchar(10))+ col)
from yourtable
cross apply
(
select 'Col1', 1 union all
select 'Col2', 2
) c(col, so)
group by Sequence, col, so
order by so, sequence
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = 'SELECT refid, ' + @cols + '
from
(
select REFID,
col = cast(Sequence as varchar(10))+ col, value
from yourtable
cross apply
(
select ''COL1'', col1 union all
select ''COL2'', col2
) c (col, value)
) x
pivot
(
max(value)
for col in (' + @cols + ')
) p
order by refid'
execute sp_executesql @query;
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