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where, group by, having
where vs having当一个sql语句中存在where子句,会先执行where,然后执行group by,然后执行having.一般来说,only use 'having' when you use 'group by'Always use 'having' with aggregate f...
分类:其他好文   时间:2014-07-07 16:58:32    阅读次数:183
uva 1069 - Always an integer(数学+暴力)
题目链接:uva 1069 - Always an integer 题目大意:给出一个多次多项式,问说是否对于任意正整数n来说结构均为整数。 解题思路:首先处理出字符串,然后枚举n从1到k+1判断即可,k为多项式中出现过的最大幂数指。 P为多项式,d为除数,k为多项式中最大的次数 当k=0时,P中不存在n变量,所以直接计算判断即可当k=1时,P是一次多项式,那么P(n+...
分类:其他好文   时间:2014-07-02 09:45:48    阅读次数:294
UVA 1069 - Always an integer(数论)
1069 - Always an integer...
分类:其他好文   时间:2014-07-02 08:12:34    阅读次数:198
Filter Plate
It always seems that your vacuum will malfunction right before company is set to arrive. What do you do if your vacuum is not working correctly? Many ...
分类:其他好文   时间:2014-07-01 22:38:53    阅读次数:305
linux常用命令大全(转)
linux 基本命令ls (list 显示当前目录下文件和目录 ls -l 详细显示 =ll )[root@linux ~]# ls [-aAdfFhilRS] 目录名称[root@linux ~]# ls [--color={none,auto,always}] 目录名称[root@linux ~...
分类:系统相关   时间:2014-06-30 22:44:24    阅读次数:461
SX Type Manual Bottom Discharge Centrifuge
Before I owned a pool I always thought that pool maintenance was going to be a real pain and troublesome. I had heard many horror stories from friends...
分类:其他好文   时间:2014-06-30 21:58:20    阅读次数:316
UValive3268 Jamie's Contact Groups(二分+最大流)
题目地址:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=1269 Jamie is a very popular girl and has quite a lot of friends, so she always keeps a v...
分类:其他好文   时间:2014-06-30 16:55:26    阅读次数:374
LeetCode: LRU Cache [146]
【题目】 Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1. se...
分类:其他好文   时间:2014-06-29 22:45:26    阅读次数:358
error "`ft2build.h' hasn't been included yet!
Add include to "freetype.h"/* add this line */#include #ifndef FT_FREETYPE_H#error "`ft2build.h' hasn't been included yet!"#error "Please always use m...
分类:其他好文   时间:2014-06-29 20:24:58    阅读次数:312
poj 3264 Balanced Lineup
DescriptionFor the daily milking, Farmer John'sNcows (1 ≤N≤ 50,000) always line up in the same order. One day Farmer John decides to organize a game o...
分类:其他好文   时间:2014-06-28 09:32:17    阅读次数:200
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