在有些情况下我们需要按指定顺序输出数据，比如选择了ID in(3,1,2,5,4)我们希望按这个3,1,2,5,4的顺序输出，这样只使用order by ID是无法实现的，
但是我们可以使用order by charindex(','+convert(varchar,ID)+',',',3,1,2,5,4,')的方法来实现这个目的。举例如下：
Create Table info(
ID int identity(1,1) not null,
title varchar(100) not null
)
insert into info(title) values('aa')
insert into info(title) values ('bb')
insert into info(title)values('cc')
insert into info(title) values('dd')
insert into info(title)values('ee')
/*方法一：*/
select id,title
from info
where id in ('','','','','')
order by charindex(','+convert(varchar,ID)+',' , ',3,1,2,5,4,')
/*方法二：*/
select id,title
from info
where id in ('','','','','')
--where id in ('1','2','3','4','5')
order by CHARINDEX(RTRIM(CAST(id as NCHAR)), ',3,1,2,5,4,')
/*其它示例*/
select prx_class,prx_name,isnull(sum(sunMen),0) as sunMen,isnull(sum(sumMoney),0) as sumMoney from
( select prx_class,prx_code,prx_name,isnull(sum(money),0) as sunMen, case when prx_code='项目冲减' then isnull(sum(num),0) * -1 else isnull(sum(num),0) end as sumMoney
from receive_paybill
WHERE the_date >='2014/6/1 0:00:00' AND the_date<='2014/6/10 0:00:00' and prx_code is not null and prx_code<>'' and substoreid=''
group by prx_code,prx_name,prx_class
) as tb
group by prx_name,prx_class
--order by CHARINDEX(RTRIM(CAST(prx_class as NCHAR)),',小商品,钟点房费,会员卡费,房费,') desc
order by charindex(','+prx_class+',',',小商品,钟点房费,会员卡费,房费,') desc