还是那道有趣的题目

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 CASE
WHEN MIN(num) = MAX(num) THEN CAST(MIN(num) AS VARCHAR)
ELSE CAST(MIN(num) AS VARCHAR) + '-' + CAST(MAX(num) AS VARCHAR)
END
FROM (
SELECT *, (num -id) AS iid
FROM (
SELECT (SELECT COUNT(1) FROM @t t1 WHERE t1.num<=t2.num) AS id,
*
FROM @t t2
) t3
) t4
GROUP BY
iid

题目来源

 http://blog.csdn.net/fredrickhu/article/details/6481452