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<h3 id="换了电脑等了几个月-makedown的语法也忘得差不多了-先用代码块包裹起来-以后再填坑"><a href="#换了电脑等了几个月-makedown的语法也忘得差不多了-先用代码块包裹起来-以后再填坑" class="headerlink" title="换了电脑等了几个月,makedown的语法也忘得差不多了,先用代码块包裹起来.以后再填坑"></a>换了电脑等了几个月,makedown的语法也忘得差不多了,先用代码块包裹起来.以后再填坑</h3><h4 id="因为只复制了原blog里的source和-config-yml目前live2d暂时移除了"><a href="#因为只复制了原blog里的source和-config-yml目前live2d暂时移除了" class="headerlink" title="因为只复制了原blog里的source和_config.yml目前live2d暂时移除了"></a>因为只复制了原blog里的source和_config.yml目前live2d暂时移除了</h4>
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<div><br><p>总结：第一范式(1NF)无重复的列 第二范式(2NF)属性完全依赖于主键 第三范式(3NF)属性不依赖于其它非主属性</p><br></div><br><div><br>第一范式（1NF）：确保每一列的原子性<br>如果每一列都是不可再分的最小数据单元，则满足第一范式。<br>第二范式:非键字段必须依赖于键字段<br>如果一个关系满足1NF，并且除了主键以外的其它列，都依赖与该主键，则满足二范式(2NF)，第二范式要求每个表只描述一件事。<br>第三范式：在1NF基础上，除了主键以外的其它列都不传递依赖于主键列，或者说： 任何非主属性不依赖于其它非主属性<br>（在2NF基础上消除传递依赖）<br>范式应用实例<br></div><br>
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<p><code></code></p>
<p><pre><br>create index …[online];<br></pre><br></p>
<div><br> <p>online和非online方式创建索引，效果相同。</p><br> <p>对于经常执行操作的表使用online更好</p><br><br> <p>online方式创建索引，由于使用了一张临时表，以ROW SHARE锁表，不会阻塞原表DML的语句。非online会以SHARE NOWAIT锁表,会阻塞</p><br> <p>由于online方式创建索引，Oracle执行工作复杂，因此更加耗时</p><br></div>
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