name date nr
x1 2006-01-01 aaaa
x1 2006-01-02 bbbb
x3 2006-01-03 dddd 转换为如下格式name 2006-01-01 2006-01-02 2006-01-03
x1 aaaa bbbb
x3 dddd 在sqlserver有什么方法可解决此问题?
x1 2006-01-01 aaaa
x1 2006-01-02 bbbb
x3 2006-01-03 dddd 转换为如下格式name 2006-01-01 2006-01-02 2006-01-03
x1 aaaa bbbb
x3 dddd 在sqlserver有什么方法可解决此问题?
set @s = 'select [name]'
select distinct @s = @s + ', min(case when [date] = ''' + [date] + ''' then nr end) as [' + [date] + ']'
from tablename
order by [date]
set @s = ' from tablename group by [name]'
exec(@s)
假设有张学生成绩表(tb_rowtocol)如下
Name Subject Result
张三 语文 73
张三 数学 83
张三 物理 93
李四 语文 74
李四 数学 84
李四 物理 94想变成
姓名 语文 数学 物理
张三 73 83 93
李四 74 84 94declare @sql varchar(4000)
set @sql = 'select Name as ' + '姓名'
select @sql = @sql + ' , sum(case Subject when '''+Subject+''' then Result end) ['+Subject+']'
from (select distinct Subject from rowtocol) as a
set @sql = @sql + ' from rowtocol group by name'
exec(@sql)
如果上述两表互相换一下:即
表名(cj)
姓名 语文 数学 物理
张三 73 83 93
李四 74 84 94想变成 Name Subject Result
张三 语文 73
张三 数学 83
张三 物理 93
李四 语文 74
李四 数学 84
李四 物理 94select 姓名 as Name,'语文' as Subject,语文 as Result from CJ union
select 姓名 as Name,'数学' as Subject,数学 as Result from CJ union
select 姓名 as Name,'物理' as Subject,物理 as Result from CJ
order by 姓名 desc
select 'x1'as [name], '2006-01-01' as [date], 'aaaa' as nr
into tablename
union select 'x1', '2006-01-02', 'bbbb'
union select 'x3', '2006-01-03', 'dddd'
-----------------------------------------------------
declare @s varchar(2000)
set @s = 'select [name]'
select @s = @s + ', min(case when [date] = ''' + [date] + ''' then nr end) as [' + [date] + ']'
from (select distinct[date] from tablename) a
set @s = @s + ' from tablename group by [name]'
exec(@s)
/*
name 2006-01-01 2006-01-02 2006-01-03
---- ---------- ---------- ----------
x1 aaaa bbbb NULL
x3 NULL NULL dddd*/
-----------------------------------------------------
drop table tablename
insert into table1(name,date,nr)
select 'x1','2006-01-01','aaaa'
union all select 'x1','2006-01-02','bbbb'
union all select 'x3','2006-01-03','dddd'
declare @sql varchar(8000)
set @sql=''
select @sql=@sql+',max(case when date = '''+date+''''+' then nr end) as '''+date+''''
from table1
exec('select distinct name '+@sql+' from table1 group by name')