转自http://www.cnblogs.com/qixuejia/archive/2010/07/14/1777105.html1.聚合函数(1)AVG函数功能返回组中值的平均值。空值将被忽略语法AVG([
ALL | DISTINCT ] expression)(2)MAX函数功能返回表达式的最...
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数据库 时间:
2014-05-05 23:23:05
阅读次数:
560
这3个系列的书我买了不少本,虽然没有都读完,但是还是要做个阶段性的评价for
dummies:即阿呆系列,外教老师Chris说那是入门的书,知识量少,我觉得自己开辟一个新的学习计划时,这个系列的书是很有帮助的,细分两个子系列all-in-one
for dummies:这个系列的书厚些,通常是几本书...
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其他好文 时间:
2014-05-05 23:16:11
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272
并查集类的c++封装,比较union_find algorithm四种实现方法之间的性能差别...
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编程语言 时间:
2014-05-05 21:25:44
阅读次数:
324
题目:
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 matter what you leave beyond the new len...
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其他好文 时间:
2014-05-05 12:58:57
阅读次数:
294
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets
so as the following conditions hold:
The product of all numbers in the first set is less ...
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其他好文 时间:
2014-05-03 23:51:19
阅读次数:
621
#pragma once#include namespace stds { class tool
{ public: std::string ws2s(const std::wstring& ws) { std::string curLocale =
setlocale(LC_ALL...
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其他好文 时间:
2014-05-03 22:25:17
阅读次数:
318
1、能用DISTINCT的就不用GROUP BY
SELECT OrderID FROM Details WHERE UnitPrice > 10 GROUP BY OrderID
可改为: SELECT DISTINCT OrderID FROM Details WHERE UnitPrice > 10
2.能用UNION ALL就不要用UNION
UNION A...
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数据库 时间:
2014-05-03 21:31:24
阅读次数:
342
【题目】
B
Age Sort
Input: Standard Input
Output: Standard Output
You are given the ages (in years) of all people of a country with at least 1 year of age. You kn...
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其他好文 时间:
2014-05-03 16:51:42
阅读次数:
427
Given a set of distinct integers, S, return all possible subsets.
Note:
Elements in a subset must be in non-descending order.The solution set must not contain duplicate subsets.
For exa...
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其他好文 时间:
2014-05-03 15:47:53
阅读次数:
289
点击打开链接
Party All the Time
Time Limit: 6000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 2961 Accepted Submission(s): 939
Problem Description...
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其他好文 时间:
2014-05-03 15:30:56
阅读次数:
374