import{_ as o,r as l,o as c,c as r,b as n,d as s,a as e,w as t,e as p}from"./app-Bx8hKGcu.js";const i={},d=n("h1",{id:"删除数据",tabindex:"-1"},[n("a",{class:"header-anchor",href:"#删除数据"},[n("span",null,"删除数据")])],-1),k=p(`<p>在 JAVA 编程环境中，您可以使用 JDBC API 单条或批量执行 DELETE 语句。</p><h2 id="单传感器时间序列值删除" tabindex="-1"><a class="header-anchor" href="#单传感器时间序列值删除"><span>单传感器时间序列值删除</span></a></h2><p>以测控 ln 集团为例，存在这样的使用场景：</p><p>wf02 子站的 wt02 设备在 2017-11-01 16:26:00 之前的供电状态出现多段错误，且无法分析其正确数据，错误数据影响了与其他设备的关联分析。此时，需要将此时间段前的数据删除。进行此操作的 SQL 语句为：</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span><span class="token operator">&lt;=</span><span class="token number">2017</span><span class="token operator">-</span><span class="token number">11</span><span class="token operator">-</span><span class="token number">01</span>T16:<span class="token number">26</span>:<span class="token number">00</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>如果我们仅仅想要删除 2017 年内的在 2017-11-01 16:26:00 之前的数据，可以使用以下 SQL:</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span><span class="token operator">&gt;=</span><span class="token number">2017</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">00</span>:<span class="token number">00</span> <span class="token operator">and</span> <span class="token keyword">time</span><span class="token operator">&lt;=</span><span class="token number">2017</span><span class="token operator">-</span><span class="token number">11</span><span class="token operator">-</span><span class="token number">01</span>T16:<span class="token number">26</span>:<span class="token number">00</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>IoTDB 支持删除一个时间序列任何一个时间范围内的所有时序点，用户可以使用以下 SQL 语句指定需要删除的时间范围：</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">&lt;</span> <span class="token number">10</span>
<span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">&lt;=</span> <span class="token number">10</span>
<span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">&lt;</span> <span class="token number">20</span> <span class="token operator">and</span> <span class="token keyword">time</span> <span class="token operator">&gt;</span> <span class="token number">10</span>
<span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">&lt;=</span> <span class="token number">20</span> <span class="token operator">and</span> <span class="token keyword">time</span> <span class="token operator">&gt;=</span> <span class="token number">10</span>
<span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">&gt;</span> <span class="token number">20</span>
<span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">&gt;=</span> <span class="token number">20</span>
<span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">=</span> <span class="token number">20</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>需要注意，当前的删除语句不支持 where 子句后的时间范围为多个由 OR 连接成的时间区间。如下删除语句将会解析出错：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>delete from root.ln.wf02.wt02.status where time &gt; 4 or time &lt; 0
Msg: 303: Check metadata error: For delete statement, where clause can only contain atomic
expressions like : time &gt; XXX, time &lt;= XXX, or two atomic expressions connected by &#39;AND&#39;
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>如果 delete 语句中未指定 where 子句，则会删除时间序列中的所有数据。</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="多传感器时间序列值删除" tabindex="-1"><a class="header-anchor" href="#多传感器时间序列值删除"><span>多传感器时间序列值删除</span></a></h2>`,14),u=p(`<div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf02<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token operator">*</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">&lt;=</span> <span class="token number">2017</span><span class="token operator">-</span><span class="token number">11</span><span class="token operator">-</span><span class="token number">01</span>T16:<span class="token number">26</span>:<span class="token number">00</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>需要注意的是，当删除的路径不存在时，IoTDB 不会提示路径不存在，而是显示执行成功，因为 SQL 是一种声明式的编程方式，除非是语法错误、权限不足等，否则都不认为是错误，如下所示。</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">&gt;</span> <span class="token keyword">delete</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf03<span class="token punctuation">.</span>wt02<span class="token punctuation">.</span><span class="token keyword">status</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">&lt;</span> <span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
Msg: The statement <span class="token operator">is</span> executed successfully<span class="token punctuation">.</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="删除时间分区-实验性功能" tabindex="-1"><a class="header-anchor" href="#删除时间分区-实验性功能"><span>删除时间分区 （实验性功能）</span></a></h2><p>您可以通过如下语句来删除某一个 database 下的指定时间分区：</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">DELETE</span> <span class="token keyword">PARTITION</span> root<span class="token punctuation">.</span>ln <span class="token number">0</span><span class="token punctuation">,</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>上例中的 0,1,2 为待删除时间分区的 id，您可以通过查看 IoTDB 的数据文件夹找到它，或者可以通过计算<code>timestamp / partitionInterval</code>（向下取整）,<br> 手动地将一个时间戳转换为对应的 id，其中的<code>partitionInterval</code>可以在 IoTDB 的配置文件中找到（如果您使用的版本支持时间分区）。</p><p>请注意该功能目前只是实验性的，如果您不是开发者，使用时请务必谨慎。</p>`,8);function m(w,h){const a=l("RouteLink");return c(),r("div",null,[d,n("p",null,[s("用户使用 "),e(a,{to:"/zh/UserGuide/V1.1.x/Reference/SQL-Reference.html"},{default:t(()=>[s("DELETE 语句")]),_:1}),s(" 可以删除指定的时间序列中符合时间删除条件的数据。在删除数据时，用户可以选择需要删除的一个或多个时间序列、时间序列的前缀、时间序列带、*路径对某一个时间区间内的数据进行删除。")]),k,n("p",null,[s("当 ln 集团 wf02 子站的 wt02 设备在 2017-11-01 16:26:00 之前的供电状态和设备硬件版本都需要删除，此时可以使用含义更广的 "),e(a,{to:"/zh/UserGuide/V1.1.x/Data-Concept/Data-Model-and-Terminology.html"},{default:t(()=>[s("路径模式（Path Pattern）")]),_:1}),s(" 进行删除操作，进行此操作的 SQL 语句为：")]),u])}const b=o(i,[["render",m],["__file","Delete-Data.html.vue"]]),v=JSON.parse('{"path":"/zh/UserGuide/V1.1.x/Delete-Data/Delete-Data.html","title":"删除数据","lang":"zh-CN","frontmatter":{"description":"删除数据 用户使用 可以删除指定的时间序列中符合时间删除条件的数据。在删除数据时，用户可以选择需要删除的一个或多个时间序列、时间序列的前缀、时间序列带、*路径对某一个时间区间内的数据进行删除。 在 JAVA 编程环境中，您可以使用 JDBC API 单条或批量执行 DELETE 语句。 单传感器时间序列值删除 以测控 ln 集团为例，存在这样的使用场景...","head":[["link",{"rel":"alternate","hreflang":"en-us","href":"https://iotdb.apache.org/UserGuide/V1.1.x/Delete-Data/Delete-Data.html"}],["meta",{"property":"og:url","content":"https://iotdb.apache.org/zh/UserGuide/V1.1.x/Delete-Data/Delete-Data.html"}],["meta",{"property":"og:site_name","content":"IoTDB Website"}],["meta",{"property":"og:title","content":"删除数据"}],["meta",{"property":"og:description","content":"删除数据 用户使用 可以删除指定的时间序列中符合时间删除条件的数据。在删除数据时，用户可以选择需要删除的一个或多个时间序列、时间序列的前缀、时间序列带、*路径对某一个时间区间内的数据进行删除。 在 JAVA 编程环境中，您可以使用 JDBC API 单条或批量执行 DELETE 语句。 单传感器时间序列值删除 以测控 ln 集团为例，存在这样的使用场景..."}],["meta",{"property":"og:type","content":"article"}],["meta",{"property":"og:locale","content":"zh-CN"}],["meta",{"property":"og:locale:alternate","content":"en-US"}],["meta",{"property":"og:updated_time","content":"2023-07-10T03:11:17.000Z"}],["meta",{"property":"article:modified_time","content":"2023-07-10T03:11:17.000Z"}],["script",{"type":"application/ld+json"},"{\\"@context\\":\\"https://schema.org\\",\\"@type\\":\\"Article\\",\\"headline\\":\\"删除数据\\",\\"image\\":[\\"\\"],\\"dateModified\\":\\"2023-07-10T03:11:17.000Z\\",\\"author\\":[]}"]]},"headers":[{"level":2,"title":"单传感器时间序列值删除","slug":"单传感器时间序列值删除","link":"#单传感器时间序列值删除","children":[]},{"level":2,"title":"多传感器时间序列值删除","slug":"多传感器时间序列值删除","link":"#多传感器时间序列值删除","children":[]},{"level":2,"title":"删除时间分区 （实验性功能）","slug":"删除时间分区-实验性功能","link":"#删除时间分区-实验性功能","children":[]}],"git":{"createdTime":1688958677000,"updatedTime":1688958677000,"contributors":[{"name":"CritasWang","email":"critas@outlook.com","commits":1}]},"readingTime":{"minutes":3.2,"words":961},"filePathRelative":"zh/UserGuide/V1.1.x/Delete-Data/Delete-Data.md","localizedDate":"2023年7月10日","autoDesc":true}');export{b as comp,v as data};