--sql 2005以上版本
select * from 
(select *,rn=row_number()over(partition by stu_id order by enddate)from tb)a
where rn=2
--sql 2000
--1、
select * from tb a  
 where not exists(select 1 from tb where stu_id=a.stu_id and endDate>a.endDate)
--2、
select * from tb where enddate in(select max(enddate) from tb group by (stu_id))

------解决方案--------------------
select * into 新表（可以随意命名，自动根据旧表生成新表表结构） from 旧表 where  id  in (select id from 旧表 where enddate in(select max(enddate) from tb group by (stu_id)) )

------解决方案--------------------
SELECT stu_id MAX(enDate) FROM tableName GROUP BY stu_id


------解决方案--------------------
SELECT stu_id ,MAX(enDate) AS enDate FROM tableName GROUP BY stu_id 
   
 上句忘加逗号。

------解决方案--------------------
SQL code
WITH test (ID, stu_id ,endDate)
 AS (
 SELECT 1, 10, '2011/10/10'
 UNION ALL 
 select 2, 10, '2011/10/11'
 UNION ALL 
 select 3, 11, '2011/10/12'
 UNION ALL 
 select 4 ,11, '2011/10/13'
 UNION ALL 
 select 5 ,12, '2011/10/14'
 UNION ALL 
 select 6 ,12, '2011/10/15')
 SELECT * FROM test a 
 WHERE EXISTS(SELECT 1 FROM (
 SELECT stu_id,MAX(enddate)enddate FROM test GROUP BY stu_id) b WHERE  a.stu_id=b.stu_id AND a.enddate=b.enddate)
 
 /*
 ID          stu_id      endDate
 ----------- ----------- ----------
 2           10          2011/10/11
 4           11          2011/10/13
 6           12          2011/10/15
 
 (3 行受影响)
 */