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SQL语句Left join 中On和Where的用法区别
SQL语句如下:SELECT * FROM 表1 LEFT JOIN 表2 ON 表1.id = 表2.id AND 表2.Name != 'ff'WHERE 表1.NAME != 'aa' 步骤1:返回笛卡尔积(SELECT * FROM表1 CROSS JOIN表2) 步骤2:应用ON筛...
分类:数据库   时间:2014-07-10 00:04:24    阅读次数:266
LeetCode:Container With Most Water
题目链接 Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two ...
分类:其他好文   时间:2014-07-07 22:25:30    阅读次数:359
【转】IOS 学习之 NSPredicate 模糊、精确、查询
转自:http://blog.csdn.net/lianbaixue/article/details/10579117简述:Cocoa框架中的NSPredicate用于查询,原理和用法都类似于SQL中的where,作用相当于数据库的过滤取。定义(最常用到的方法):NSPredicate *ca = ...
分类:移动开发   时间:2014-07-07 22:07:20    阅读次数:293
MS SQL Server带有时间的记录怎样查询
原文:MS SQL Server带有时间的记录怎样查询比如某一张表[A]有一个保存日期包含时间字段[B],如果以这个段[B]作查询条件对数据记录进行查询。也我们得花些心思才能查询到我们想得到的记录。现在我们需要查询这天2014-06-21的所有记录:SELECT * FROM [A] WHERE [...
分类:数据库   时间:2014-07-07 21:00:01    阅读次数:216
Word Search
Given a 2D board and a word, find if the word exists in the grid.The word can be constructed from letters of sequentially adjacent cell, where "adjace...
分类:其他好文   时间:2014-07-07 17:30:29    阅读次数:160
Problem Linked List Cycle II
Problem Description:Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull.Follow up:Can you solve it without u...
分类:其他好文   时间:2014-07-07 17:00:35    阅读次数:161
Problem Path Sum II
Problem Description:Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.Solution: 递归。 1 public List>...
分类:其他好文   时间:2014-07-07 16:59:12    阅读次数:169
[LeetCode] Gas Station,转化为求最大序列的解法,和更简单简单的Jump解法。
LeetCode上 Gas Station是比较经典的一题,它的魅力在于算法足够优秀的情况下,代码可以简化到非常简洁的程度。原题如下Gas StationThere areNgas stations along a circular route, where the amount of gas at...
分类:其他好文   时间:2014-06-30 11:13:40    阅读次数:244
LeetCode: Word Break II [140]
【题目】 Given a string s and a dictionary of words dict, add spaces in s to construct a sentence where each word is a valid dictionary word. Return all such possible sentences. For example, given s = "catsanddog", dict = ["cat", "cats", "and", "sand", "dog...
分类:其他好文   时间:2014-06-30 00:51:41    阅读次数:295
LeetCode: Linked List Cycle II [142]
【题目】 Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Follow up: Can you solve it without using extra space? 【题意】 给定一个单向链表,如果链表有环,则返回环开始的位置。 【思路】 仍然是维护两个指针, p1, p2, p1每次走一步, p2每次走两步 ...
分类:其他好文   时间:2014-06-29 23:59:21    阅读次数:354
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