Oracle中支持窗口函数ROW_NUMBER()，其用法和 MSSQLServer2005中相同，比如我们
执行下面的 SQL语句：
SELECT * FROM
(
SELECT ROW_NUMBER() OVER(ORDER BY FSalary DESC) row_num,
FNumber,FName,FSalary,FAge FROM T_Employee
) a
WHERE a.row_num>=3 AND a.row_num<=5
ADD_MONTHS(FBirthDay,2),
Case 用法一:
SELECT
FName,
(CASE FName
WHEN ‘Tom‘ THEN ‘GoodBoy‘
WHEN ‘Lily‘ THEN ‘GoodGirl‘
WHEN ‘Sam‘ THEN ‘BadBoy‘
WHEN ‘Kerry‘ THEN ‘BadGirl‘
ELSE ‘Normal‘
END) as isgood
FROM T_Person
CASE
WHEN condition1 THEN returnvalue1
WHEN condition 2 THEN returnvalue2
WHEN condition 3 THEN returnvalue3
……
ELSE defaultreturnvalue
END
Oracle窗口函数显示想要的行数
原文：http://www.cnblogs.com/IcanFixIt/p/4708991.html
