如何解决SQL Server Pivot:通过动态列分组
DECLARE @cols AS NVARCHAR(MAX); DECLARE @query AS NVARCHAR(MAX);
select @cols = STUFF((SELECT distinct ',' +
QUOTENAME(Replace(variable,char(CAST(0x0016 as int)),'')) val
FROM TABLEDATA
ORDER BY val asc
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
, 1, 1, '');
SELECT @query =
'SELECT
time,
country,
disease,
' + @cols + '
FROM (
Select
time,
country,
disease,
variable,
convert(decimal(10, 2), value) as value
From
TABLEDATA
) t
PIVOT
(
Sum(value)
FOR variable IN( ' + @cols + ' )' +
' ) AS p; ';
Execute(@query);
解决方法
我在一张table上做了一个透视图,生成了动态列:
DECLARE @cols AS NVARCHAR(MAX);
DECLARE @query AS NVARCHAR(MAX);
select @cols = STUFF((SELECT distinct ',' +
QUOTENAME(Replace(variable,char(CAST(0x0016 as int)),'')) val
FROM TABLEDATA
ORDER BY val asc
FOR XML PATH(''),TYPE
).value('.','NVARCHAR(MAX)'),1,'');
SELECT @query =
'SELECT
time,country,disease,' + @cols + '
FROM
TABLEDATA
PIVOT
(
MAX(value)
FOR variable IN( ' + @cols + ' )' +
' ) AS p; ';
execute(@query);
它返回以下结果:
time | country | disease | indicateur1 | indicateur2 | ... | indicateur14 | ... | indicateurn
-----------------------------------------------------------------------------------------
2001 | FRANCE | MAL | 0.003 | | | | |
2002 | FRANCE | AID | | 0.45 | | | |
1997 | ITALY | HIV | 0.307 | | | | |
1999 | ROMANIA | MAL | 1.044 | | | | |
2003 | ROMANIA | AID | | | | 0.77 | |
2003 | ROMANIA | AID | 0.872 | | | | |
2004 | ROMANIA | HIV | | 0.921 | | | |
2002 | IRELAND | MAL | | 0.008 | | | |
但是我需要按前三列进行分组以获取以下内容:
time | country | disease | indicateur1 | indicateur2 | ... | indicateur14 | ... | indicateurn
-----------------------------------------------------------------------------------------
2001 | FRANCE | MAL | 0.003 | | | | |
2002 | FRANCE | AID | | 0.45 | | | |
1997 | ITALY | HIV | 0.307 | | | | |
1999 | ROMANIA | MAL | 1.044 | | | | |
2003 | ROMANIA | AID | 0.872 | | | 0.77 | |
2004 | ROMANIA | HIV | | 0.921 | | | |
2002 | IRELAND | MAL | | 0.008 | | | |
所以我需要group by time,disease
,但是由于我的枢纽专栏是动态的,所以我无法设法找到解决方案…
这是一个SQL小提琴
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