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“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...th many rows, I want to skip duplicate entries that would otherwise cause failure. After some research, my options appear to be the use of either:
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Need for predictable random generator
...ndomness in small runs of some games is undesirable -- it does seem too unfair for some use cases.
I wrote a simple Shuffle Bag like implementation in Ruby and did some testing. The implementation did this:
If it still seems fair or we haven't reached a threshold of minimum rolls, it returns a...
Difference between add(), replace(), and addToBackStack()
What is the main difference between calling these methods:
9 Answers
9
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转型产品经理必看 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...重的问题。工程思维模式下，缺乏用户意识，当然就更谈不上用户体验了。有问题不是坏事，可怕的是发现不了问题，发现问题后我开始解决问题，于是，我逐渐进入第二阶段。
阶段二：功能思维
发现工程思维下的产品工作...
C++实现一款简单完整的聊天室服务器+客户端 - C/C++ - 清泛网 - 专注C/C++及内核技术
...7,32767);
m_allmsg.ReplaceSel(msg);
}else{
MessageBox("无法连接到服务器！");
closesocket(sock);
WSACleanup();
}
}
GetDlgItem(IDC_DISCONNECT)->EnableWindow(TRUE);
GetDlgItem(IDC_SEND)->EnableWindow(TRUE);
GetDlgItem(IDC_CHANGENAME)->EnableWindow(TRUE)...
How do I view all commits for a specific day?
...rking on a specific day and update my timesheet based on that, but it's a pain in the ass to type in the full date in ISO format so I just do it like this
git log --after=jun9 --before=jun10
and I add --author to only print my commits
git log --since=jun9 --until=jun10 --author=Robert
This pr...
Schema for a multilanguage database
... This option is similar to my option nr 1 but better. It is still hard to maintain and requires creating new tables for new languages, so I'd be reluctant to implement it.
– qbeuek
Nov 27 '08 at 10:22
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2015年硅谷最火的高科技创业公司都有哪些 - 资讯 - 清泛网 - 专注C/C++及内核技术
...便的数据仓库解决方案，就是SQL接口，跟各个云服务无缝连接，最大特点就是快，在TB到PB级别非常好的性能，我在工作中也是直接使用，它还支持不同的硬件平台，如果想速度更快，可以使用SSD的，当然支持容量就小些。
Hadoop...
Solving “Who owns the Zebra” programmatically?
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Here's a solution in Python based on constraint-programming:
from constraint import AllDifferentConstraint, InSetConstraint, Problem
# variables
colors = "blue red green white yellow".split()
nationalities = "Norwegian German Dane Swede English".split()
pet...
App Inventor 2 项目合并工具 AIMerge · App Inventor 2 中文网
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本文档最初由米尔斯学院（Mills College）的 Kate Feeney 为 AI Classic 编写。该计划在她的论文通...