SQL语句编译的时候没有有关问题，执行时出错，请教咋回事

SQL语句编译的时候没有问题，执行时出错，请问怎么回事？

SQL code

drop table t1create table t1(id varchar(10),cusno varchar(10),price numeric(10,2))insert t1 select 'S012','A',35.02union allselect 'S012','C',38.60union all select 'S013','A',52.00Declare   @S   Varchar(8000) Select   @S='Select   ID,'Select   @S=@S + 'SUM(Case  Cusno   When '''+ Cusno+ ''' Then   Price   Else   0.00   End)   As   Price' + Cusno From   t1   Group   By   Cusno Select   @S   =   @S   +  ' From   t1   Group   By   ID 'EXEC(@S) GO 

SQL code

drop table t1create table t1(id varchar(10),cusno varchar(10),price numeric(10,2))insert t1 select 'S012','A',35.02union allselect 'S012','C',38.60union all select 'S013','A',52.00Declare   @S   Varchar(8000) Select   @S='Select   ID'Select   @S=@S + ',SUM(Case  Cusno   When '''+ Cusno+ ''' Then   Price   Else   0.00   End)   As   Price' + Cusno From   t1   Group   By   Cusno Select   @S   =   @S   +  ' From   t1   Group   By   ID 'exec(@S) GO /*ID         PriceA                                   PriceC                                   ---------- ---------------------------------------- ---------------------------------------- S012       35.02                                    38.60S013       52.00                                    .00*/
[解决办法]
SQL code
declare @s varchar(8000) 
 set @s='select id' 
 select @s=@s +',sum(case cusno when '''+cusno+''' then price else 0.00 end) as price'+cusno 
 from t1 group by cusno 
 select @s=@s+' from t1 group by id' 
 exec  (@s) 
 


1\select   @s=@s+ '   from   t1   group   by   id '   在from   前加一个空格


2\另个select   @s=@s   + ',sum(case   cusno   when   ' ' '+cusno+ ' ' '   then   price   else   0.00   end)   as   price '+cusno  

as   price   后的空格去掉