动态分组查询 收藏
原帖地址:
http://community.youkuaiyun.com/Expert/topic/3428/3428792.xml?temp=.6476251
--示例数据
create table 表(ID int,NUM int)
insert 表 select 1,2
union all select 2,3
union all select 3,2
union all select 4,2
union all select 5,12
union all select 6,2
union all select 7,1
union all select 8,5
union all select 9,1
go
/*--问题说明:
输入分组参数,比如输入 "3,6" ,实现按 ID<=3,3<ID<=6,ID>6 分组查询
输入分组参数,比如输入 "2,5,8" ,实现按 ID<=2,2<ID<=5,5<ID<=8,ID>8 分组查询
--*/
--查询的存储过程
create proc p_qry
@numlist varchar(1000)
as
set nocount on
declare @t table(id int identity,组 varchar(10),a int,b int)
declare @i int,@pnum varchar(10)
select @i=charindex(',',@numlist+',')
,@pnum=left(@numlist,@i-1)
,@numlist=stuff(@numlist,1,@i,'')
,@i=charindex(',',@numlist)
insert @t select 'id<='+@pnum,null,@pnum
while @i>0
begin
insert @t select @pnum+'<id<='+left(@numlist,@i-1),@pnum,left(@numlist,@i-1)
select @pnum=left(@numlist,@i-1)
,@numlist=stuff(@numlist,1,@i,'')
,@i=charindex(',',@numlist)
end
insert @t select 'id>'+@numlist,@numlist,null
select b.组,num=sum(a.num)
from 表 a,@t b
where case
when b.a is null then case when a.id<=b.b then 1 else 0 end
when b.b is null then case when a.id>b.a then 1 else 0 end
else case when a.id>b.a and a.id<=b.b then 1 else 0 end
end=1
group by b.组
order by min(b.id)
go
--调用存储过程进行查询
exec p_qry '2,5,8'
go
--删除测试
drop table 表
drop proc p_qry
/*--测试结果
组 num
---------- -----------
id<=2 5
2<id<=5 16
id>8 1
--*/
本文来自优快云博客,转载请标明出处:http://blog.youkuaiyun.com/zjcxc/archive/2004/10/09/128945.aspx
本文介绍了一种在SQL中实现动态分组查询的方法,通过存储过程接收一组数值作为参数,并根据这些数值动态地将数据分为不同的组。这种方法适用于需要根据不同区间对数据进行灵活分组的场景。
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