create table A
(
Id int identity,
Name char(10)
)
create table B
(
Id int,
[SubJect] char(10),
Score int
)
–1.查询各科成绩排名前二名的人的编号 No 姓名Name 科目Subject 分数Score
select * from (SELECT *,rn=ROW_NUMBER() OVER(PARTITION BY subject ORDER BY score desc)
FROM B) t where t.rn<=2
限制结果集。返回第3行到第5行的数据
（ ROW_NUMBER 不能用在where子句中，所以将带行号的执行结果作为子查询，就可以将结果当成表一样用了）：
SELECT * FROM
(
SELECT ROW_NUMBER() OVER(ORDER BY FSalary DESC) AS rownum,
FNumber,FName,FSalary,FAge FROM T_Employee
)
AS a
WHERE a.rownum>=3 AND a.rownum<=5
