| import{_ as e,o as a,c as s,a as n,f as t}from"./app-wIgiOADQ.js";const i={},r=t(`<h1 id="general-sql-statements" tabindex="-1"><a class="header-anchor" href="#general-sql-statements" aria-hidden="true">#</a> General SQL Statements</h1><h2 id="database-management" tabindex="-1"><a class="header-anchor" href="#database-management" aria-hidden="true">#</a> Database Management</h2><p>Database is similar to the database in the relational database, which is a collection of structured time series data.</p><h3 id="create-database" tabindex="-1"><a class="header-anchor" href="#create-database" aria-hidden="true">#</a> create database</h3><p>Create a database named <code>root.ln</code> with the following syntax:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> <span class="token keyword">DATABASE</span> root<span class="token punctuation">.</span>ln |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="show-databases" tabindex="-1"><a class="header-anchor" href="#show-databases" aria-hidden="true">#</a> show databases</h3><p>View all databases:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SHOW</span> <span class="token keyword">DATABASES</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="delete-database" tabindex="-1"><a class="header-anchor" href="#delete-database" aria-hidden="true">#</a> delete database</h3><p>Drop the database named <code>root.ln</code>:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">DELETE</span> <span class="token keyword">DATABASE</span> root<span class="token punctuation">.</span>ln |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="count-databases" tabindex="-1"><a class="header-anchor" href="#count-databases" aria-hidden="true">#</a> count databases</h3><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>COUNT <span class="token keyword">DATABASES</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="time-series-management" tabindex="-1"><a class="header-anchor" href="#time-series-management" aria-hidden="true">#</a> Time Series Management</h2><p>Time series is a collection of data points indexed by time. In IoTDB, time series refers to a complete sequence of measurement points. This section mainly introduces the management of time series.</p><h3 id="create-timeseries" tabindex="-1"><a class="header-anchor" href="#create-timeseries" aria-hidden="true">#</a> create timeseries</h3><p>The encoding method and data type need to be specified. For example, create a time series named <code>root.ln.wf01.wt01.temperature</code>:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> TIMESERIES root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01<span class="token punctuation">.</span>temperature <span class="token keyword">WITH</span> datatype<span class="token operator">=</span><span class="token keyword">FLOAT</span><span class="token punctuation">,</span>ENCODING<span class="token operator">=</span>RLE |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="show-timeseries" tabindex="-1"><a class="header-anchor" href="#show-timeseries" aria-hidden="true">#</a> show timeseries</h3><p>View all time series:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SHOW</span> TIMESERIES |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Use wildcards to match time series under database <code>root.ln</code>:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SHOW</span> TIMESERIES root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="delete-timeseries" tabindex="-1"><a class="header-anchor" href="#delete-timeseries" aria-hidden="true">#</a> delete timeseries</h3><p>Delete a time series named <code>root.ln.wf01.wt01.temperature</code>:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">DELETE</span> TIMESERIES root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01<span class="token punctuation">.</span>temperature |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="count-timeseries" tabindex="-1"><a class="header-anchor" href="#count-timeseries" aria-hidden="true">#</a> count timeseries</h3><p>Count the total number of time series:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>COUNT TIMESERIES root<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Count the number of time series under a wildcard path:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>COUNT TIMESERIES root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="time-series-path-management" tabindex="-1"><a class="header-anchor" href="#time-series-path-management" aria-hidden="true">#</a> Time Series Path Management</h2><p>In addition to the concept of time series, IoTDB also has the concepts of subpaths and devices.</p><p><strong>Subpath</strong>: It is a part of the path in a complete time series name. For example, if the time series name is <code>root.ln.wf01.wt01.temperature</code>, then <code>root.ln</code>, <code>root.ln.wf01</code>, and <code>root.ln.wf01.wt01</code> are all its subpaths.</p><p><strong>Device</strong>: It is a combination of a group of time series. In IoTDB, the device is a subpath from the root to the penultimate node. If the time series name is <code>root.ln.wf01.wt01.temperature</code>, then <code>root.ln.wf01.wt01</code> is its device.</p><h3 id="show-devices" tabindex="-1"><a class="header-anchor" href="#show-devices" aria-hidden="true">#</a> show devices</h3><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SHOW</span> DEVICES |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="show-child-paths" tabindex="-1"><a class="header-anchor" href="#show-child-paths" aria-hidden="true">#</a> show child paths</h3><p>Check out the next level of <code>root.ln</code>:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SHOW</span> CHILD PATHS root<span class="token punctuation">.</span>ln |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="show-child-nodes" tabindex="-1"><a class="header-anchor" href="#show-child-nodes" aria-hidden="true">#</a> show child nodes</h3><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SHOW</span> CHILD NODES root<span class="token punctuation">.</span>ln |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="count-devices" tabindex="-1"><a class="header-anchor" href="#count-devices" aria-hidden="true">#</a> count devices</h3><p>Count the number of devices:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>COUNT DEVICES |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="count-nodes" tabindex="-1"><a class="header-anchor" href="#count-nodes" aria-hidden="true">#</a> count nodes</h3><p>Count the number of nodes at the specified level in the path:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>COUNT NODES root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> <span class="token keyword">LEVEL</span><span class="token operator">=</span><span class="token number">2</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="query-data" tabindex="-1"><a class="header-anchor" href="#query-data" aria-hidden="true">#</a> Query Data</h2><p>The following are commonly used query statements in IoTDB.</p><h3 id="query-the-data-of-the-specified-time-series" tabindex="-1"><a class="header-anchor" href="#query-the-data-of-the-specified-time-series" aria-hidden="true">#</a> Query the data of the specified time series</h3><p>Query all time series data under the device <code>root.ln.wf01.wt01</code>:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SELECT</span> <span class="token operator">*</span> <span class="token keyword">FROM</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="query-time-series-data-within-a-certain-time-range" tabindex="-1"><a class="header-anchor" href="#query-time-series-data-within-a-certain-time-range" aria-hidden="true">#</a> Query time series data within a certain time range</h3><p>Query the data in the time series <code>root.ln.wf01.wt01.temperature</code> whose timestamp is greater than 2022-01-01T00:05:00.000:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SELECT</span> temperature <span class="token keyword">FROM</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01 <span class="token keyword">WHERE</span> <span class="token keyword">time</span> <span class="token operator">></span> <span class="token number">2022</span><span class="token operator">-</span><span class="token number">01</span><span class="token operator">-</span><span class="token number">01</span>T00:<span class="token number">05</span>:<span class="token number">00.000</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="query-time-series-data-whose-values-are-within-the-specified-range" tabindex="-1"><a class="header-anchor" href="#query-time-series-data-whose-values-are-within-the-specified-range" aria-hidden="true">#</a> Query time series data whose values are within the specified range</h3><p>Query the data whose value is greater than 36.5 in the time series <code>root.ln.wf01.wt01.temperature</code>:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SELECT</span> temperature <span class="token keyword">FROM</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01 <span class="token keyword">WHERE</span> temperature <span class="token operator">></span> <span class="token number">36.5</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="use-last-to-query-the-latest-point-data" tabindex="-1"><a class="header-anchor" href="#use-last-to-query-the-latest-point-data" aria-hidden="true">#</a> Use last to query the latest point data</h3><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SELECT</span> <span class="token keyword">last</span> <span class="token operator">*</span> <span class="token keyword">FROM</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div>`,62);function d(o,l){return a(),s("div",null,[n(` |
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| `),r])}const p=e(i,[["render",d],["__file","General-SQL-Statements.html.vue"]]);export{p as default}; |
