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sql 分组后 组内排名
语法:ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN)简单的说row_number()从1开始,为每一条分组记录返回一个数字,这里的ROW_NUMBER() OVER (ORDER BY xlh DESC) 是先把xlh列降序,再为降序以后...
分类:数据库   时间:2014-06-28 18:08:45    阅读次数:574
leetcode - Binary Tree Level Order Traversal i ii
题目:Binary Tree Level Order Traversal i iii和ii的差别仅在于最后将结果逆序一下就行了,算法上基本相同个人思路:1、二叉树的层次遍历,我们一层一层地处理,用一个队列(A队列)将每一层的所有节点按照从左到右的顺序入队2、待该队列的所有节点都出队,并且用另外一个队...
分类:其他好文   时间:2014-06-28 17:01:33    阅读次数:235
分页SQL
一、Oracle1、SQL-- order bySELECT * FROM (SELECT ORACLEPAGESQL1.*, ROWNUM RN FROM (SELECT * FROM (SELECT IDX, NAME, CH_NAME FR...
分类:数据库   时间:2014-06-28 16:54:16    阅读次数:282
LeetCode: Add Two Numbers
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single ...
分类:其他好文   时间:2014-06-28 14:31:12    阅读次数:201
[LeetCode] Remove Element
Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn't mat...
分类:其他好文   时间:2014-06-21 07:17:47    阅读次数:210
JMM规范
JMM规范:The rules for happens-before are:Program order rule. Each action in a thread happens-before every action in that thread that comes later in the ...
分类:其他好文   时间:2014-06-21 06:49:15    阅读次数:350
leetcode - Convert Sorted Array to Binary Search Tree
题目:Convert Sorted Array to Binary Search TreeGiven an array where elements are sorted in ascending order, convert it to a height balanced BST.个人思路:1、选...
分类:其他好文   时间:2014-06-21 06:37:00    阅读次数:183
[LeetCode] Convert Sorted Array to Binary Search Tree
Given an array where elements are sorted in ascending order, convert it to a height balanced BST.说明:平衡二叉搜索树,即任何结点的左子树和右子树高度最多相差1的二叉搜索树。二叉搜索树:二叉查找树(Bin...
分类:其他好文   时间:2014-06-21 00:47:08    阅读次数:221
Windows中使用MySQL 数据查询(三)
一、排序 select * from employees order by name; 字符型默认字符顺序(也就是说z永远比a大),不管大小写;如果想按编码值排序(也就是说小写永远大于大写),则使用 select * from employees order by binary name;二、...
分类:数据库   时间:2014-06-20 18:00:44    阅读次数:278
mysql 个人笔记
mysql修改最后一条记录&删除第一条记录 收藏 //修改最后一条记录UPDATE userinfo set userid='55' WHERE 1 ORDER BY userid DESC LIMIT 1//删除第一条记录delete from userinfo where 1 order by ...
分类:数据库   时间:2014-06-20 14:50:07    阅读次数:305
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