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mysql count(*) vs count(1)
perfer count( ) 1. "官方文档" : _InnoDB handles SELECT COUNT( ) and SELECT COUNT(1) operations in the same way. There is no performance difference._ 2. 阿里 ...
分类:数据库   时间:2019-02-03 15:34:11    阅读次数:215
集合set
集合set“”set是一个无序不重复元素集,基本功能包括关系测试和消除重复元素。set支持union(联合), intersection(交), difference(差)和sysmmetric difference(对称差集 )等数学运算。set支持x in set, len(set), for ...
分类:其他好文   时间:2019-02-02 23:20:27    阅读次数:206
Codeforces 1108E2 Array and Segments (Hard version) 差分, 暴力
Codeforces 1108E2 E2. Array and Segments (Hard version) Description: The only difference between easy and hard versions is a number of elements in the ...
分类:其他好文   时间:2019-02-02 23:06:10    阅读次数:510
ASP.NET OAuth Authorization - Difference between using ClientId and Secret and Username and Password
What I don't fully understand is the use of ClientId and Secret vs Username and Password. The code I pasted generates a token by username and password ...
分类:Web程序   时间:2019-02-01 18:10:28    阅读次数:152
Imbalanced Array CodeForces - 817D (思维+单调栈)
You are given an array a consisting of n elements. The imbalance value of some subsegment of this array is the difference between the maximum and mini ...
分类:其他好文   时间:2019-01-28 23:07:13    阅读次数:192
osx的du以字节计算
https://stackoverflow.com/questions/5794437/difference-in-size-shown-by-du-command-and-get-info-on-mac-os-x https://superuser.com/questions/520338/onl ...
分类:其他好文   时间:2019-01-26 19:32:44    阅读次数:289
WCF系列(一)BasicHttpBinding 和 WsHttpBinding 的不同点
WCF系列(一)【翻译】BasicHttpBinding 和 WsHttpBinding 的不同点 2010-02-21 12:23 by Virus-BeautyCode, 20206 阅读, 7 评论, 收藏, 编辑 原文地址:Difference between BasicHttpBindin ...
分类:Web程序   时间:2019-01-22 10:46:18    阅读次数:221
What's the difference between UTF-8 and UTF-8 without BOM?
https://stackoverflow.com/questions/2223882/whats-the-difference-between-utf-8-and-utf-8-without-bom Answer1 The UTF-8 BOM is a sequence of Bytes at t ...
分类:其他好文   时间:2019-01-21 16:09:40    阅读次数:143
tf.Session()、tf.InteractiveSession()
tf.Session()和tf.InteractiveSession()的区别 官方tutorial是这么说的: The only difference with a regular Session is that an InteractiveSession installs itself as t ...
分类:其他好文   时间:2019-01-18 17:24:17    阅读次数:190
Lab 6-4
In this lab, we’ll analyze the malware found in the file Lab06 04.exe . Questions and Short Answers 1. What is the difference between the calls made f ...
分类:其他好文   时间:2019-01-14 17:12:31    阅读次数:146
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