sql server 多列转一行

0808xyj 2015-03-19 11:13:21

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reenjie 2015-03-19

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#3樓表名弄錯了，修正一下。


select 
Sum(case when name='A' then age else null end) as Aage,
Max(case when name='A' then sex else null end) as Asex,
Sum(case when name='A' then kg else null end) as Akg,
Sum(case when name='B' then age else null end) as Bage,
Max(case when name='B' then sex else null end) as Bsex,
Sum(case when name='B' then kg  else null end) as Bkg,
Sum(case when name='C' then age else null end) as Cage,
Max(case when name='C' then sex else null end) as Csex,
Sum(case when name='C' then kg else null end) as Ckg
from Student

还在加载中灬 2015-03-19

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DECLARE @SQL VARCHAR(8000)--SQL2005+可以用VARCHAR(MAX)代替
SET @SQL=''
SELECT @SQL=@SQL+',MAX(CASE WHEN name='''+name+''' THEN age END)['+name+'age]'
	+',MAX(CASE WHEN name='''+name+''' THEN sex END)['+name+'sex]'
	+',MAX(CASE WHEN name='''+name+''' THEN kg END)['+name+'kg]'
FROM student GROUP BY name
SET @SQL='SELECT '+STUFF(@SQL,1,1,'')+'FROM student'
--PRINT @SQL
EXEC(@SQL)

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reenjie 2015-03-19

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引用 2 楼 reenjie 的回复:


select 
Sum(case when name='A' then age else null end) as Aage,
Sum(case when name='A' then sex else null end) as Asex,
Sum(case when name='A' then kg else null end) as Akg,
Sum(case when name='B' then age else null end) as Bage,
Sum(case when name='B' then sex else null end) as Bsex,
Sum(case when name='B' then kg  else null end) as Bkg,
Sum(case when name='C' then age else null end) as Cage,
Sum(case when name='C' then sex else null end) as Csex,
Sum(case when name='C' then kg else null end) as Ckg
from Student

上面的sql 有誤，小作調整


select 
Sum(case when name='A' then age else null end) as Aage,
Max(case when name='A' then sex else null end) as Asex,
Sum(case when name='A' then kg else null end) as Akg,
Sum(case when name='B' then age else null end) as Bage,
Max(case when name='B' then sex else null end) as Bsex,
Sum(case when name='B' then kg  else null end) as Bkg,
Sum(case when name='C' then age else null end) as Cage,
Max(case when name='C' then sex else null end) as Csex,
Sum(case when name='C' then kg else null end) as Ckg
from t1

reenjie 2015-03-19

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select 
Sum(case when name='A' then age else null end) as Aage,
Sum(case when name='A' then sex else null end) as Asex,
Sum(case when name='A' then kg else null end) as Akg,
Sum(case when name='B' then age else null end) as Bage,
Sum(case when name='B' then sex else null end) as Bsex,
Sum(case when name='B' then kg  else null end) as Bkg,
Sum(case when name='C' then age else null end) as Cage,
Sum(case when name='C' then sex else null end) as Csex,
Sum(case when name='C' then kg else null end) as Ckg
from Student