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947.289h669.74a134.36 134.36 0 00133.94-133.938V277.595a134.314 134.314 0 00-133.94-133.938zm33.473 267.877H147.126a33.145 33.145 0 01-33.473-33.473c0-18.752 14.72-33.473 33.473-33.473h736.687c18.752 0 33.472 14.72 33.472 33.473a33.145 33.145 0 01-33.472 33.473z"></path></svg><span><!----></span><meta property="datePublished" content="2023-10-25T10:37:38.000Z"></span><!----><span class="page-reading-time-info" aria-label="阅读时间"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>大约 3 分钟</span><meta property="timeRequired" content="PT3M"></span><!----><!----></div><hr></div><div class="toc-place-holder"><aside id="toc"><!--[--><!----><!--]--><div class="toc-header">此页内容<button type="button" class="print-button" title="打印"><svg xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button></div><div class="toc-wrapper"><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level2" href="/#数据库管理">数据库管理</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2" href="/#时间序列管理">时间序列管理</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2" href="/#时间序列路径管理">时间序列路径管理</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2" href="/#查询数据">查询数据</a></li><!----><!--]--></ul><div class="toc-marker" 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| --><h1 id="常用sql语句" tabindex="-1"><a class="header-anchor" href="#常用sql语句" aria-hidden="true">#</a> 常用SQL语句</h1><h2 id="数据库管理" tabindex="-1"><a class="header-anchor" href="#数据库管理" aria-hidden="true">#</a> 数据库管理</h2><p>数据库（Database）类似关系数据库中的 Database，是一组结构化的时序数据的集合。</p><ul><li>创建数据库</li></ul><p>创建一个名为 root.ln 的数据库,语法如下：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>CREATE DATABASE root.ln |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>查看数据库</li></ul><p>查看所有数据库：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SHOW DATABASES |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>删除数据库</li></ul><p>删除名为 root.ln 的数据库：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>DELETE DATABASE root.ln |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>统计数据库数量</li></ul><p>统计数据库的总数</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>COUNT DATABASES |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="时间序列管理" tabindex="-1"><a class="header-anchor" href="#时间序列管理" aria-hidden="true">#</a> 时间序列管理</h2><p>时间序列（Timeseries）是以时间为索引的数据点的集合，在IoTDB中时间序列指的是一个测点的完整序列，本节主要介绍时间序列的管理方式。</p><ul><li>创建时间序列</li></ul><p>需指定编码方式与数据类型。例如创建一条名为root.ln.wf01.wt01.temperature的时间序列：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>CREATE TIMESERIES root.ln.wf01.wt01.temperature WITH datatype=FLOAT,ENCODING=RLE |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>查看时间序列</li></ul><p>查看所有时间序列：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SHOW TIMESERIES |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>使用通配符匹配数据库root.ln下的时间序列：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SHOW TIMESERIES root.ln.** |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>删除时间序列</li></ul><p>删除名为 root.ln.wf01.wt01.temperature 的时间序列</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>DELETE TIMESERIES root.ln.wf01.wt01.temperature |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>统计时间序列</li></ul><p>统计时间序列的总数</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>COUNT TIMESERIES root.** |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>统计某通配符路径下的时间序列数量：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>COUNT TIMESERIES root.ln.** |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="时间序列路径管理" tabindex="-1"><a class="header-anchor" href="#时间序列路径管理" aria-hidden="true">#</a> 时间序列路径管理</h2><p>除时间序列概念外，IoTDB中还有子路径、设备的概念。</p><p>**子路径：**是一条完整时间序列名称中的一部分路径，如时间序列名称为root.ln.wf01.wt01.temperature，则root.ln、root.ln.wf01、root.ln.wf01.wt01都是其子路径。</p><p>**设备：**是一组时间序列的组合，在 IoTDB 中设备是由root至倒数第二级节点的子路径，如时间序列名称为root.ln.wf01.wt01.temperature，则root.ln.wf01.wt01是其设备</p><ul><li>查看设备</li></ul><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SHOW DEVICES |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>查看子路径</li></ul><p>查看 root.ln 的下一层：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SHOW CHILD PATHS root.ln |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>查看子节点</li></ul><p>查看 root.ln 的下一层：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SHOW CHILD NODES root.ln |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>统计设备数量</li></ul><p>统计所有设备</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>COUNT DEVICES |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>统计节点数</li></ul><p>统计路径中指定层级的节点个数</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>COUNT NODES root.ln.** LEVEL=2 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="查询数据" tabindex="-1"><a class="header-anchor" href="#查询数据" aria-hidden="true">#</a> 查询数据</h2><p>以下为IoTDB中常用查询语句。</p><ul><li>查询指定时间序列的数据</li></ul><p>查询root.ln.wf01.wt01设备下的所有时间序列的数据</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SELECT * FROM root.ln.wf01.wt01 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>查询某时间范围内的时间序列数据</li></ul><p>查询root.ln.wf01.wt01.temperature时间序列中时间戳大于 2022-01-01T00:05:00.000 的数据</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SELECT temperature FROM root.ln.wf01.wt01 WHERE time > 2022-01-01T00:05:00.000 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>查询数值在指定范围内的时间序列数据</li></ul><p>查询root.ln.wf01.wt01.temperature时间序列中数值大于 36.5 的数据：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SELECT temperature FROM root.ln.wf01.wt01 WHERE temperature > 36.5 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>使用 last 查询最新点数据</li></ul><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>SELECT last * FROM root.ln.wf01.wt01 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/zh/UserGuide/Master/QuickStart/General-SQL-Statements.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link label"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->发现错误？在 GitHub 上编辑此页<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span><!----></a></div><div class="meta-item git-info"><div class="update-time"><span class="label">上次编辑于: </span><!----></div><div class="contributors"><span class="label">贡献者: </span><!--[--><!--[--><span class="contributor" title="email: 105700158+wanghui42@users.noreply.github.com">wanghui42</span><!--]--><!--]--></div></div></footer><!----><!----><!----><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">master</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2023 The Apache Software Foundation.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"> We use <a href="https://analytics.google.com">Google Analytics</a> to collect anonymous, aggregated usage information. </p></footer></div><!--]--><!--]--><!----><!--]--></div> |
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