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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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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...目的经验，他发现有必要开发一个通用的开放架构的网络模型，从而让不同软硬件的网络都可以互相通信。在1973年Vinton Cerf也参与了这个项目，他们俩于同年实现了TCP的第一个版本。1974年的时候，TCP协议规范正式发布，编号为RF...
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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为何谷歌不可复制？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...程师提出了他们的解决方案，通过重建广告相关度的数据模型，提供更精确的推荐结果，这个理念成为谷歌Adwords赖以生存的基础，也成就了谷歌接下来十年领跑搜索广告领域的重要技术支持。
“这件事最重要的细节是什么？”...
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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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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App Inventor 2 项目合并工具 AIMerge
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App Inventor 2 项目合并工具
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...
Which is faster: Stack allocation or Heap allocation
This question may sound fairly elementary, but this is a debate I had with another developer I work with.
23 Answers
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