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      <title>2024面试记录</title>
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      <description>2024社招的几次笔试面试记录。</description>
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      <title>2022面试记录</title>
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      <description>社招的几次笔试面试记录。</description>
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      <title>MySQL 数据库知识</title>
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      <pubDate>Sat, 26 Dec 2020 18:58:00 +0000</pubDate>
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&lt;h2 id=&#34;数据库模块划分&#34;&gt;数据库模块划分&lt;/h2&gt;
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&lt;li&gt;满足 SELECT 子句中的列名必须为分组列或列函数&lt;/li&gt;
&lt;li&gt;列函数对于 GROUP BY 子句定义的每一个组各返回一个结果&lt;/li&gt;
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&lt;li&gt;通常与 GROUP BY 子句一起使用&lt;/li&gt;
&lt;li&gt;WHERE 过滤行，HAVING 过滤组&lt;/li&gt;
&lt;li&gt;关键字的顺序：WHERE &amp;ndash; GROUP BY &amp;ndash; HAVING&lt;/li&gt;
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&lt;h3 id=&#34;为什么要使用索引&#34;&gt;为什么要使用索引&lt;/h3&gt;
&lt;p&gt;全表扫描适用范围窄，借助字典的思想，使用索引可以加快查询速度。&lt;/p&gt;</description>
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      <title>网络相关知识总结</title>
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      <pubDate>Sun, 20 Dec 2020 11:01:32 +0000</pubDate>
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      <description>国际标准化组织 ISO 提出的开放系统互联基本参考模型（Open Systems Interconnection Reference Model），简称为 OSI ，是一个概念模型。</description>
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