SqlServer 行列转换

1: 列转为行: eg1: Create table test (name char(10),km char(10),cj int) go insert test values('张三','语文',80) insert test values('张三','数学',86) insert test values('张三','英语',75) insert test values('李四','语文',78) insert test values('李四','数学',85) insert test values('李四','英语',78) 想变成 姓名 语文 数学 英语 张三 80 86 75 李四 78 85 78 declare @sql varchar(8000) set @sql = 'select name' select @sql = @sql + ',sum(case km when '''+km+''' then cj end) ['+km+']' from (select distinct km from test) as a select @sql = @sql+' from test group by name' exec(@sql) drop table test eg2: 有表A, id pid 1 1 1 2 1 3 2 1 2 2 3 1 如何化成表B: id pid 1 1,2,3 2 1,2 3 1 或者是从表B变成A(不要用游标) 以前有相似的列子,现在找不到了,帮帮忙! --1.创建一个合并的函数 create function fmerg(@id int) returns varchar(8000) as begin declare @str varchar(8000) set @str='' select @str=@str+','+cast(pid as varchar) from 表A where id=@id set @str=right(@str,len(@str)-1) return(@str) End go --调用自定义函数得到结果 select distinct id,dbo.fmerg(id) from 表A     2: /*********** 行转列 *****************/ 测试： create table t1 (a int,b int,c int,d int,e int,f int,g int,h int) insert t1 values(15, 9, 1, 0, 1, 2, 2, 0) declare @ varchar(8000) set @='' select @=@+rtrim(name)+' from t1 union all select ' from syscolumns where id=object_id('t1') set @=left(@,len(@)-len(' from t1 union all select ')) --print @ exec('select '+@+' from t1') a ----------- 15 9 1 0 1 2 2 0     3: 将结果矩阵转置。 http://expert.csdn.net/Expert/topic/2390/2390314.xml?temp=.4681055 老衲： if exists (select * from sysobjects where id = object_id('proc_sky_blue') and xtype ='P') drop proc proc_sky_blue go create proc proc_sky_blue (@tablename varchar(200)) as begin set nocount on declare @col nvarchar(256) declare @makesql nvarchar(4000) declare @insertsql nvarchar(4000) declare @caculatesql nvarchar(400) declare @count int declare @i int create table #tmp (colname nvarchar(20)) select @caculatesql = 'select @count=count(1) from ' + @tablename exec sp_executesql @caculatesql, N'@count int output',@count output if @count >=1024 begin raiserror('表的行数太多了，我转不了',16,1) end else begin select @i=0 while @count >0 begin select @i=@i+1 select @makesql = 'alter table #tmp add col'+convert(varchar(20),@i)+' int' exec(@makesql) select @count=@count-1 end declare my_cursor cursor for select name from syscolumns where id=object_id(@tablename) order by colid open my_cursor fetch next from my_cursor into @col while @@fetch_status = 0 begin select @makesql ='select @insertsql= @insertsql + convert(varchar(4),'+@col+') +'','' from ' +@tablename select @insertsql =N'insert #tmp values ('''+@col+ ''',' execute sp_executesql @makesql,N'@insertsql nvarchar(4000) output' ,@insertsql output select @insertsql = left(@insertsql,len(@insertsql)-1) +')' exec(@insertsql) fetch next from my_cursor into @col end close my_cursor deallocate my_cursor select * from #tmp set nocount off end end go ----------------分析 declare @tablename varchar(200) set @tablename='table1' begin set nocount on declare @col nvarchar(256) declare @makesql nvarchar(4000) declare @insertsql nvarchar(4000) declare @caculatesql nvarchar(400) declare @count int declare @i int create table #tmp (colname nvarchar(20)) select @caculatesql = 'select @count=count(1) from ' + @tablename exec sp_executesql @caculatesql, N'@count int output',@count output if @count >=1024 begin raiserror('表的行数太多了，我转不了',16,1) end else begin select @i=0 while @count >0 begin select @i=@i+1 select @makesql = 'alter table #tmp add col'+convert(varchar(20),@i)+' int' exec(@makesql) select @count=@count-1 end declare my_cursor cursor for select name from syscolumns where id=object_id(@tablename) order by colid open my_cursor fetch next from my_cursor into @col while @@fetch_status = 0 begin select @makesql ='select @insertsql= @insertsql + convert(varchar(4),'+@col+') +'','' from ' +@tablename select @insertsql =N'insert #tmp values ('''+@col+ ''',' execute sp_executesql @makesql,N'@insertsql nvarchar(4000) output' ,@insertsql output select @insertsql = left(@insertsql,len(@insertsql)-1) +')' select @insertsql --exec(@insertsql) fetch next from my_cursor into @col end close my_cursor deallocate my_cursor select * from #tmp set nocount off drop table #tmp end end