请教个SQL语法

create table ##Test (员工编号 int, 奖金 money, 年 int, 月 int)
insert ##Test
select 108, 48.9, 2006, 1 union all
select 108, 18.3, 2006, 1 union all
select 108, 140, 2006, 1 union all
select 110, 10, 2006, 1 union all
select 110, 1470, 2006, 1 union all
select 110, 11, 2006, 1 union all
select 110, 33, 2006, 1 union all
select 102, 45, 2006, 1 union all
select 102, 2, 2006, 1 union all
select 102, 42.5, 2006, 1 union all
select 108, 42.5, 2006, 2 union all
select 102, 70, 2006, 2 union all
select 108, 45, 2006, 4 union all
select 108, 2, 2006, 4 union all
select 110, 70, 2006, 4 union all
select 102, 50, 2006, 4 union all
select 102, 1470, 2006, 4

declare @sql varchar(8000)
set @sql = 'select 员工编号'
select @sql = @sql + ', ' + '[' + cast(月 as varchar) + '月] = sum(case 月 when ' + cast(月 as varchar) + ' then 奖金 else 0 end)' from ##Test group by 月
set @sql = @sql + ' from ##Test where 年 = 2006 group by 员工编号'

exec (@sql)
/*
员工编号1月2月4月
10289.500070.00001520.0000
108207.200042.500047.0000
1101524.0000.000070.0000
*/

drop table ##test
已经运行通过了