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Oracle中的索引详解
一、 ROWID的概念存储了row在数据文件中的具体位置:64位 编码的数据,A-Z, a-z, 0-9, +, 和 /,row在数据块中的存储方式SELECT ROWID, last_name FROM hr.employees WHERE department_id = 20;比 如:OOOOO...
分类:数据库   时间:2015-05-14 13:48:54    阅读次数:226
Two Sum
Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two numbers such that they add up to the target, where in...
分类:其他好文   时间:2015-05-14 10:09:29    阅读次数:131
分页的两种方式
1. 利用row_number()语法:select 字段1,.. row_number() over (order by 字段) as rowno from table where 条件 and rowno >(pageIndex-1)*pageSize and rowno (@pageIndex...
分类:其他好文   时间:2015-05-14 00:57:32    阅读次数:176
UVA 11992(Fast Matrix Operations-线段树区间加&改)[Template:SegmentTree]
There is a matrix containing at most 106 elements divided into r rows and c columns. Each element has a location (x; y) where 1  x  r, 1  y  c. Initially, all the elements are zero. You need to...
分类:其他好文   时间:2015-05-13 23:18:45    阅读次数:411
修改ORACLE的字段顺序
首先你要有一个pl/sql,其实没有也行,但是这数据库还是有一个可视化界面为好啊。 1.首先,以sys用户的身份登录PL/SQL 2.查询出你要更改的表的ID,以我本地的数据为例,我要改'FINACE'用户下'INCOME'这张表。注:ORACLE中的表要用大写。   select object_id   from all_objects   where owner = ...
分类:数据库   时间:2015-05-13 22:03:16    阅读次数:231
[LeetCode]*84.Largest Rectangle in Histogram
题目Given n non-negative integers representing the histogram’s bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.Above is a histogram where width of each ba...
分类:其他好文   时间:2015-05-13 19:52:46    阅读次数:125
阿里云远程如何访问mysql
【查看mysql用户的初始密码】 如果是用的“市场镜像” 装过php环境的 使用 cat /你的安装环境/account.log 查看你的mysql 安装密码 一、mysql 部分的配置 【1.修改root密码】 update user set password=password('新密码') where user='root'; 【2.修改用...
分类:数据库   时间:2015-05-13 19:51:57    阅读次数:157
Mysql触发器使用过程中遇到的问题
[1054] Unknown column 'xxxxx' in 'where clause'DROP TRIGGER IF EXISTS `delete_actdata`; CREATE DEFINER=`secway`@`localhost` TRIGGER `delete_actdata` BEFORE DELETE ON `actdata` FOR EACH ROW BEGIN DEL...
分类:数据库   时间:2015-05-13 19:50:00    阅读次数:160
oracle 11g drop table 后闪回
--初始化数据 drop table test purge; create table test as select * from dba_objects; delete from test where object_id is null; alter table test add constraint pk_test_object_id primary key(object_id); ...
分类:数据库   时间:2015-05-13 19:46:55    阅读次数:248
Valid Sudoku
Determine if a Sudoku is valid, according to:Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where empty cells are filled with ...
分类:其他好文   时间:2015-05-13 19:34:33    阅读次数:123
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