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ROW_NUMBER()函数
--摘录自《T-SQL编程入门经典》 ROW_NUMBER()函数根据作为参数传递给这个函数的 ORDER BY 子句的值,返回一个不断递增的整数值。如果 ROW_NUMBER 的 ORDER BY 的值和结果集中的顺序相匹配,返回值将是递增的,以升序排列。如果 ROW_NUMBER 的 ORDE....
分类:其他好文   时间:2014-08-09 13:25:17    阅读次数:270
[leetcode]Binary Tree Level Order Traversal II
Binary Tree Level Order Traversal IIGiven a binary tree, return thebottom-up level ordertraversal of its nodes' values. (ie, from left to right, level...
分类:其他好文   时间:2014-08-08 23:53:16    阅读次数:221
Remove Duplicates from Sorted Array
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:2014-08-08 23:52:12    阅读次数:238
[leetcode]Binary Tree Level Order Traversal
Binary Tree Level Order TraversalGiven a binary tree, return thelevel ordertraversal of its nodes' values. (ie, from left to right, level by level).Fo...
分类:其他好文   时间:2014-08-08 23:51:06    阅读次数:265
[leetcode]Binary Tree Zigzag Level Order Traversal
Binary Tree Zigzag Level Order TraversalGiven a binary tree, return thezigzag level ordertraversal of its nodes' values. (ie, from left to right, then...
分类:其他好文   时间:2014-08-08 23:48:36    阅读次数:307
SQL学习笔记:选取第N条记录
Northwind数据库,选取价格第二高的产品。有两种方法,一个是用Row_Number()函数:SELECT productname FROM (SELECT TOP 2 productname, Row_Number() OVER (ORDER BY unitprice desc) AS...
分类:数据库   时间:2014-08-08 21:15:36    阅读次数:244
Oracle中的 row_number() over (partition by order by ) 用法
oracle 里面经常这样用select col1,col2..., row_number() over (partition by colx order by coly) from table_name;;这句话的意思是把表中的数值按照colx 分组,每一组内部按照coly排序,同时 row_nu...
分类:数据库   时间:2014-08-08 20:40:56    阅读次数:307
HDU4927:Series 1(JAVA大数)
Problem Description Let A be an integral series {A1, A2, . . . , An}. The zero-order series of A is A itself. The first-order series of A is {B1, B2, . . . , Bn-1},where Bi = Ai+1 - Ai. Th...
分类:编程语言   时间:2014-08-08 16:12:48    阅读次数:200
SQL常规查询详解
一、交叉连接(cross join)交叉连接(cross join):有两种,显式的和隐式的,不带on子句,返回的是两表的乘积,也叫笛卡尔积。例如:下面的语句1和语句2的结果是相同的。 语句1:隐式的交叉连接,没有cross join。select o.id, o.order_number, c.i...
分类:数据库   时间:2014-08-08 15:09:16    阅读次数:374
HDU 4923 Room and Moor
Problem Description PM Room defines a sequence A = {A1, A2,..., AN}, each of which is either 0 or 1. In order to beat him, programmer Moor has to construct another sequence B = {B1, B2,... , BN} of...
分类:其他好文   时间:2014-08-07 23:18:54    阅读次数:308
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