一道有趣的题目 转F

请教各位：

数据记录是这样的

1

2

3

4

5

12

17

18

19

20

25

请问sqlserver2000如何显示成这样1-5，12，17-20，25



declare
@t table(num
int)

insert
into @t
select
1

union
all select
2

union
all select
3

union
all select
4

union
all select
5

union
all select
12

union
all select
17

union
all select
18

union
all select
19

union
all select
20

union
all select
25

select

rtrim(a.num)+(case
when
min(b.num)!=a.num
then
'-'+rtrim(min(b.num))
else
'' end)

from

(select t.num
from
@t t where
not
exists(select
1
from
@t where num=t.num-1))
a,

(select t.num
from
@t t where
not
exists(select
1
from
@t where num=t.num+1))
b

where

a.num<=b.num

group
by a.num /*

-------------------------

1-5

12

17-20

25

*/