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<!DOCTYPE html>
<html lang="zh-CN">
<head><meta name="generator" content="Hexo 3.9.0">
<meta charset="utf-8">
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta http-equiv="content-language" content="zh-CN">
<link rel="dns-prefetch" href="https://yansheng836.bitbucket.io">
<title>荷塘月色的博客</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="description" content="生活不止漫无天日的代码和bug，还有诗和远方。">
<meta name="keywords" content="荷塘月色,开发者,程序猿,Java,Spring,SpringMVC,MyBatis,MySQL数据库,开发工具,Git,GitHub,Hexo,yilia,Linux,Python,前端,资源">
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<meta property="og:title" content="荷塘月色的博客">
<meta property="og:url" content="https://yansheng836.bitbucket.io/index.html">
<meta property="og:site_name" content="荷塘月色的博客">
<meta property="og:description" content="生活不止漫无天日的代码和bug，还有诗和远方。">
<meta property="og:locale" content="zh-CN">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="荷塘月色的博客">
<meta name="twitter:description" content="生活不止漫无天日的代码和bug，还有诗和远方。">
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<style type="text/css">
#container.show {
background: linear-gradient(200deg,#a0cfe4,#e8c37e);
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gtag('js', new Date());
gtag('config', 'UA-150373134-1');
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<header id="header" class="inner">
<a href="/" class="profilepic">
<img src="https://oss.yansheng.fun/head.jpg" class="js-avatar">
</a>
<hgroup>
<div class="header-author"><a href="/">荷塘月色</a></div>
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<p class="header-subtitle">每天进步一点点</p>
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<li><a href="/">主页</a></li>
<li><a href="/categories">分类</a></li>
<li><a href="/archives">归档</a></li>
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<span>总文章数 445</span>
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<a class="links" href="/links/index.html" target="_blank" >友链</a>
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<div class="social">
<a class="github" target="_blank" href="https://github.com/yansheng836" title="github"><i class="icon-github"></i></a>
<a class="csdn" target="_blank" href="https://blog.csdn.net/weixin_41287260" title="csdn"><i class="icon-csdn"></i></a>
<a class="rss" target="_blank" href="/rss2.xml" title="rss"><i class="icon-rss"></i></a>
<a class="mail" target="_blank" href="mailto:sheng.yan836@gmail.com" title="mail"><i class="icon-mail"></i></a>
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<header id="header" class="inner">
<div class="profilepic">
<img src="https://oss.yansheng.fun/head.jpg" class="js-avatar">
</div>
<hgroup>
<div class="header-author js-header-author">荷塘月色</div>
</hgroup>
<p class="header-subtitle"><i class="icon icon-quo-left"></i>每天进步一点点<i class="icon icon-quo-right"></i></p>
<nav class="header-nav">
<div class="social">
<a class="github" target="_blank" href="https://github.com/yansheng836" title="github"><i class="icon-github"></i></a>
<a class="csdn" target="_blank" href="https://blog.csdn.net/weixin_41287260" title="csdn"><i class="icon-csdn"></i></a>
<a class="rss" target="_blank" href="/rss2.xml" title="rss"><i class="icon-rss"></i></a>
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<li style="width: 20%"><a href="/">主页</a></li>
<li style="width: 20%"><a href="/categories">分类</a></li>
<li style="width: 20%"><a href="/archives">归档</a></li>
<li style="width: 20%"><a href="/photos">相册</a></li>
<li style="width: 20%"><a href="/message-wall">留言墙</a></li>
</ul>
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</header>
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</nav>
<div class="page-header" style="">
<span>🍻
<span id="jinrishici-sentence" title="今日诗词">正在加载今日诗词....</span>
</span>
<script src="https://sdk.jinrishici.com/v2/browser/jinrishici.js" charset="utf-8"></script>
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<p><img src="https://cdn.jsdelivr.net/gh/yansheng836/github-oss/image/postgres.png" alt></p>
<h2 id="一-明确主题">一、明确主题</h2>
<p>引语</p>
<ul>
<li>如何使用索引？（what 什么是索引？why 为什么需要索引？how 如何创建索引？when 什么时候走索引？）</li>
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<h2 id="零-声明">零、声明</h2>
<h3 id="0-1将信将疑">0.1将信将疑</h3>
<blockquote>
<p>《哈姆雷特》是莎士比亚的四大悲剧之一。莎士比亚曾经说过“一万个读者有一万个哈姆雷特”，意思是每个人的教育背景不同，心境不同，领悟不同，对于《哈姆雷特》的解读当然也就不同。现在这句话适用范围更广泛，表达的意思就是各人有各人的理解，对同一事物理解不尽相同。</p>
<p>– <a href="https://jikipedia.com/definition/baidu_qa/205772626" target="_blank" rel="noopener">https://jikipedia.com/definition/baidu_qa/205772626</a></p>
<p><img src="https://cdn.jsdelivr.net/gh/yansheng836/github-oss/csdn-img/eedcada5d2124a35a1173dafc7bacf14.jpeg#pic_center" alt="在这里插入图片描述"></p>
</blockquote>
<p>以下大部分内容都是<strong>个人观点</strong>，非官方术语，不保证正确性，仅供参考。</p>
<p>（如果大家觉得有什么地方不对，可以提出来，一起探讨，共同学习。）</p>
<p>对于网络上的一些资料也该如此：将信将疑、胆大猜测、小心求证。</p>
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<h2 id="一-雪花算法图解">一、雪花算法图解</h2>
<p>理论一大堆，总结如下图：<br>
<img src="https://cdn.jsdelivr.net/gh/yansheng836/github-oss/csdn-img/20200826115308653.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaWZlaXllY2h1YW4=,size_16,color_FFFFFF,t_70#pic_center" alt="在这里插入图片描述"><br>
下方为源码，返回的结果为19位，为10进制表示，使用二进制表示就是64位，所以不必有所疑惑。</p>
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<p>使用pycharm一段时间后 ，C盘空间也越来越小。这是因为pycharm在C盘生成了大量的缓存文件。解决C盘占用过大，有两个方法：</p>
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