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Oracle ROWNUM用法和分页查询总结
分页查询格式1 在查询的最外层控制分页的最小值和最大值。查询语句如下: SELECT * FROM ( SELECT A.*, ROWNUM RN FROM (SELECT * FROM TABLE_NAME) A ) WHERE RN BETWEEN 21 AND 40 分页查询格式2 SELECT * FROM ( SELECT A.*, ROWNUM RN FROM (SELECT * FROM TABLE_NAME) A WHERE ROWNUM =...
分类:数据库   时间:2015-01-15 14:18:32    阅读次数:324
LVS与其他负载均衡软件的区别
有人在邮件列表问haproxy的作者为何haproxy无论是tcp模式还是http模式,能支撑的并发量都不是太大。Willy回答了这个问题。Exactly. The difference is between LBs that process a stream and whichare proxy-...
分类:其他好文   时间:2015-01-15 08:09:26    阅读次数:151
cocos2d 自带算法
/**@defCCRANDOM_MINUS1_1 returnsarandomfloatbetween-1and1 返回一个随机漂浮在-1和1之间的随机数*/ #defineCCRANDOM_MINUS1_1()((2.0f*((float)rand()/RAND_MAX))-1.0f) /**@defCCRANDOM_0_1 returnsarandomfloatbetween0and1 返回一个随机漂浮在0和1之间的随机数 */ #defi..
分类:编程语言   时间:2015-01-14 18:26:33    阅读次数:785
LeetCode--Binary Tree Zigzag Level Order Traversal
Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). For example: Given binary ...
分类:其他好文   时间:2015-01-14 12:52:20    阅读次数:176
FPC Trace Pattern Layout Design Notices (軟板線路設計注意事項)
整理了一些軟板(FPCB/Flex Cable)製造廠關於線路設計的要求 (Design Guide)以避免應用上的品質問題。1.Relationship between Through Hole,Land, Cover Film, and Cover CoatNot Recommended(不建議...
分类:其他好文   时间:2015-01-14 09:42:00    阅读次数:1027
[leetcode]Maximum Gap
问题描述: Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Try to solve it in linear time/space. Return 0 if the array contains less than 2 ele...
分类:其他好文   时间:2015-01-13 23:17:46    阅读次数:330
[leetcode]103 Binary Tree Zigzag Level Order Traversal
问题描述: Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). For example: Given ...
分类:其他好文   时间:2015-01-13 19:49:51    阅读次数:152
ORACLE中用rownum分页并排序的SQL语句
ORACLE中用rownum分页并排序的SQL语句 以前分页习惯用这样的SQL语句: select * from (select t.*,rownum row_num from mytable t order by t.id) b where b.row_num between 1 and 10 结...
分类:数据库   时间:2015-01-13 15:37:16    阅读次数:168
sqllite 之根据时间区间筛选数据
创建的数据库 现要对 Between '2015-1-12 00:00:00' AND '2015-1-12 23:00:00'之间的数据进行查找   没查到数据,是不是需要转换为datetime格式呢? 这样写select * from sensor_data where timestamp Between datetime('2015-1-12 00:00:00') AND d...
分类:数据库   时间:2015-01-13 12:31:00    阅读次数:159
POJ 1741 Tree
DescriptionGive a tree with n vertices,each edge has a length(positive integer less than 1001).Define dist(u,v)=The min distance between node u and v....
分类:其他好文   时间:2015-01-12 23:50:04    阅读次数:222
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