社區問的人太多了，保存一個備用
--建立測試環境
set nocount on
create table test(model varchar(20),date int ,qty int)
insert into test select 'a','8','10'
insert into test select 'a','10','50'
insert into test select 'b','8','100'
insert into test select 'b','9','200'
insert into test select 'b','10','100'
insert into test select 'c','10','200'
insert into test select 'd','10','300'
insert into test select 'e','11','250'
insert into test select 'e','12','100'
insert into test select 'f','12','150'
go
--測試
declare @sql varchar(8000)
set @sql='select model,'
select @sql=@sql+'sum(case when date='''+cast(date as varchar(10))+''' then qty else 0 end)['+cast(date as varchar(10))+'],'
from (select distinct top 100 percent date
from test order by date)a
set @sql =left(@sql,len(@sql)-1)+' from test group by model'
exec(@sql)
--刪除測試環境
drop table test
set nocount off
/**//*
model 8 9 10 11 12
-------------------- ----------- ----------- ----------- ----------- -----------
a 10 0 50 0 0
b 100 200 100 0 0
c 0 0 200 0 0
d 0 0 300 0 0
e 0 0 0 250 100
f 0 0 0 0 150
*/
