子查询案例陈述不同的值然后在哪里的条款

Question

我有一个查询，我已经写过两种方式1）在主查询中使用where子句，然后在子查询中使用case语句。我在这里略有差异（<1％）并且希望有人能提供见解吗？

1）我的代码有问题吗？ 2）根据我的陈述在哪里汇总这个是否存在差异？

代码＃1：子查询和子查询中的分组依据

select Type,sum(a.product)                                  
from 
(select a.line, case when c.ID='XX' then 'xx'
when (c.ID='AA' and c.STATE not in('KY')) then 'AA' end as Type
, sum(product_ind) as product
from line_item a 
join info c
on a.Dw=c.DW
where 1=1
group by a.line, case when c.ID='XX' then 'xx'
when (c.ID='AA' and c.STATE not in('KY')) then 'AA' end) a
where 1=1
and a.product>0
group by a.type

VS

代码＃2：主要条款中的Where子句的子查询

select Type,sum(a.product)                                  
from 
(select a.line, c.id, c.state
from line_item a 
join info c
 on a.Dw=c.DW
where 1=1
group by a.line,c.id,c.state)a
where 1=1
and a.product>0
and a.ID='AA' 
and a.STATE not in('KY') 
group by a.type