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ThinkPHP 多表查询-如果字段A相同,则把字段B相加
在一个项目中,需要查询表tr_product中的user_id字段,如果user_id相同,则把其对应的money字段相加,数据库截图如下:实现代码:$Model = D('Model');$res =$Model->query("SELECT user_id,sum(money) from tr_...
分类:Web程序   时间:2014-07-12 13:11:17    阅读次数:287
SQL PIVOT
SELECT最终要展现的列,旧表的列也行,PIVOT表的别名.列名(在下方IN里面) as 别名也行FROM 表 PIVOT( SUM(要统计的值,在新表中每行出现一次,出现在归属于in里[]的某列下面,其余为null) FOR [旧表的列,新表中以此列下面行的值为列名,列名在IN里面以[]列...
分类:数据库   时间:2014-07-12 00:24:56    阅读次数:250
Multiply Strings
Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large and are non-nega...
分类:其他好文   时间:2014-07-12 00:15:07    阅读次数:268
Add Binary
Given two binary strings, return their sum (also a binary string).For example,a ="11"b ="1"Return"100"class Solution {public: string addBinary(stri...
分类:其他好文   时间:2014-07-11 20:05:47    阅读次数:224
SGU 224.Little Queens
时间限制:0.75s空间限制:6M题意 n*n(n>1; r同理,即rint n, sum, max, k, m;void dfs (int line , int row, int l, int r, int k) { int pos, p, i; if (line > n){ ...
分类:其他好文   时间:2014-07-11 17:59:56    阅读次数:358
leetcode 题解:Merge Sorted Array(两个已排序数组归并)
题目:Given two sorted integer arrays A and B, merge B into A as one sorted array.Note:You may assume that A has enough space (size that is greater or eq...
分类:其他好文   时间:2014-07-10 14:41:23    阅读次数:177
1到n数组,和为指定数所有序列问题
(1)方法一,背包问题解法 1 #include 2 using namespace std; 3 #include 4 #include 5 6 //采用背包问题方法,从后向前,最后一个放和不放背包里,注意递归退出条件和sum==n后,没有return而是继续 7 vector a; ...
分类:其他好文   时间:2014-07-10 14:32:24    阅读次数:130
HDU 1258:Sum It Up
Sum It Up Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3695    Accepted Submission(s): 1873 Problem Description Given a specifie...
分类:其他好文   时间:2014-07-09 12:25:10    阅读次数:191
POJ2406-Power Strings(kmp循环节)
Power Strings Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 31111   Accepted: 12982 Description Given two strings a and b we define a*b to be their concate...
分类:其他好文   时间:2014-07-09 11:11:53    阅读次数:155
【LeetCode】Path Sum
题目 Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example: Given the below binary tree ...
分类:其他好文   时间:2014-07-09 10:32:42    阅读次数:151
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