转自:http://www.maomao365.com/?p=5471
摘要:
下文主要讲述动态行列转换语句，列名会根据行数据的不同，
动态的发生变化
----------------------------------------------------
实现思路:
主要将待生成的动态列名，采用脚本拼接起来，然后采用pivot函数
运行，得到相应的结果
本脚本运行环境:
sql server 2008
/*生成源数据表*/
create table #t
(compname varchar(20),
cheXi varchar(30),
dayInfo int,
daySaleValue int) /*生成源数据*/
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','锐志','',20)
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','皇冠','',10)
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','霸道','',30)
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','锐志','',40)
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','RAV4','',60)
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','锐志','',8)
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','霸道','',6)
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','RAV4','',9)
insert into #t(compname,cheXi,dayInfo,daySaleValue) values('一汽丰田','RAV4','',10) /*
select * from
(select compname,daySaleValue,dayInfo,chexi from #t) as d
/*注意事项: pivot所涉及的聚合列 value_column 和 pivot_column
都必须存在 上面的查询表中
*/
pivot(sum(daySaleValue) for dayInfo
in([],[],[],[],[],[],[],[],[],[]))
t ;
*/
/*拼接字符串*/
declare @sql varchar(max)
set @sql =' select * from
(select compname,daySaleValue,dayInfo,chexi from #t) as d
pivot(sum(daySaleValue) for dayInfo
in(
'; /*动态组合列名*/
declare @lieMing varchar(7000) ---定义动态生成列名存放变量
declare @i int ,@imax int,@field varchar(60) ---定义临时循环变量
declare @fieldList table(keyId int identity,field varchar(60)) ---定义临时表，存放待生成动态列名的数据
insert into @fieldList(field) select distinct dayInfo from #t ---生成列名数据 -------------循环表生成列名start--------------
set @lieMing =''
set @i=1
select @imax =max(keyId) from @fieldList t
while @i <@imax
begin
select @field =field from @fieldList t where t.keyId=@i
if isnull(@field,'') !=''
begin
if @lieMing !='' begin set @lieMing =@lieMing +',' end
set @lieMing = @lieMing+'['+@field+']';
end
set @i=@i+1
end
-------------循环表生成列名end--------------
/*动态组合列*/ set @sql =@sql +@lieMing +' )) t ;'; ---拼接sql语句
exec (@sql) ---执行sql脚本，生成相关数据 truncate table #t
drop table #t
