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| 系统设计 |
| <!----></a></div><div class="nav-item"><a href="/zh/Download/" class="nav-link">下载</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">社区</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/Community/About.html" class="nav-link">关于社区</a></li><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external"> |
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| 基金会 |
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| GitHub |
| <span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB简介</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>快速上手</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>数据模式与概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>语法约定</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>应用编程接口</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>元数据操作</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>数据写入和删除</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>数据查询</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>数据处理</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html" class="sidebar-link">用户定义函数(UDF)</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#udf-类型" class="sidebar-link">UDF 类型</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#udf-依赖" class="sidebar-link">UDF 依赖</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#udtf-user-defined-timeseries-generating-function" class="sidebar-link">UDTF（User Defined Timeseries Generating Function）</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#完整-maven-项目示例" class="sidebar-link">完整 Maven 项目示例</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#udf-注册" class="sidebar-link">UDF 注册</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#udf-卸载" class="sidebar-link">UDF 卸载</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#udf-查询" class="sidebar-link">UDF 查询</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#查看所有注册的-udf" class="sidebar-link">查看所有注册的 UDF</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#用户权限管理" class="sidebar-link">用户权限管理</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#配置项" class="sidebar-link">配置项</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#贡献-udf" class="sidebar-link">贡献 UDF</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#已知的-udf-库实现" class="sidebar-link">已知的 UDF 库实现</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/UDF-User-Defined-Function.html#q-a" class="sidebar-link">Q&A</a></li></ul></li><li><a href="/zh/UserGuide/Master/Process-Data/Select-Into.html" aria-current="page" class="active sidebar-link">查询写回(SELECT INTO)</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Select-Into.html#sql" class="sidebar-link">SQL</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Select-Into.html#权限" class="sidebar-link">权限</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Select-Into.html#配置参数" class="sidebar-link">配置参数</a></li></ul></li><li><a href="/zh/UserGuide/Master/Process-Data/Continuous-Query.html" class="sidebar-link">连续查询(CQ)</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Continuous-Query.html#sql-语句" class="sidebar-link">SQL 语句</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Continuous-Query.html#系统参数配置" class="sidebar-link">系统参数配置</a></li></ul></li><li><a href="/zh/UserGuide/Master/Process-Data/Triggers.html" class="sidebar-link">触发器</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Triggers.html#编写触发器" class="sidebar-link">编写触发器</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Triggers.html#管理触发器" class="sidebar-link">管理触发器</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Triggers.html#实用工具类" class="sidebar-link">实用工具类</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Triggers.html#forwardtrigger" class="sidebar-link">ForwardTrigger</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Triggers.html#完整的-maven-示例项目" class="sidebar-link">完整的 Maven 示例项目</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Triggers.html#重要注意事项-2" class="sidebar-link">重要注意事项</a></li></ul></li><li><a href="/zh/UserGuide/Master/Process-Data/Alerting.html" class="sidebar-link">告警机制</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Alerting.html#概览" class="sidebar-link">概览</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Alerting.html#部署-alertmanager" class="sidebar-link">部署 AlertManager</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Alerting.html#创建-trigger" class="sidebar-link">创建 trigger</a></li><li class="sidebar-sub-header"><a href="/zh/UserGuide/Master/Process-Data/Alerting.html#写入数据" class="sidebar-link">写入数据</a></li></ul></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>权限管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>运维工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>分布式</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>UDF 资料库</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>参考</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="查询写回-select-into"><a href="#查询写回-select-into" class="header-anchor">#</a> 查询写回（SELECT ... INTO ...）</h1> <p><code>SELECT ... INTO ...</code> 语句允许您将查询结果集写回到指定序列上。</p> <h2 id="sql"><a href="#sql" class="header-anchor">#</a> SQL</h2> <h3 id="语法"><a href="#语法" class="header-anchor">#</a> 语法</h3> <p><strong>下面是 <code>select</code> 语句的语法定义：</strong></p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>selectClause |
| intoClause? |
| fromClause |
| whereClause? |
| specialClause? |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>如果去除 <code>intoClause</code> 子句，那么 <code>select</code> 语句即是单纯的查询语句。</p> <p><code>intoClause</code> 子句是写回功能的标记语句。</p> <p><strong>下面是 <code>intoClause</code> 子句的定义：</strong></p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>intoClause |
| : <span class="token keyword">INTO</span> ALIGNED? intoPath <span class="token punctuation">(</span>COMMA intoPath<span class="token punctuation">)</span><span class="token operator">*</span> |
| <span class="token punctuation">;</span> |
| |
| intoPath |
| : fullPath |
| <span class="token operator">|</span> nodeNameWithoutStar <span class="token punctuation">(</span>DOT nodeNameWithoutStar<span class="token punctuation">)</span><span class="token operator">*</span> |
| <span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><p><code>intoPath</code>（目标序列）支持两种方式指定：</p> <ul><li><p>以 <code>root</code> 开头的完整序列名指定</p> <ul><li><p>例子：</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>t1<span class="token punctuation">,</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li></ul></li> <li><p>不以 <code>root</code> 开头的部分序列名指定，此时目标序列由 <code>from</code> 子句中的序列前缀和<code>intoPath</code>拼接而成</p> <ul><li><p>例子：</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> t1<span class="token punctuation">,</span> t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>这等价于</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>t1<span class="token punctuation">,</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li></ul></li></ul> <p><strong>在<code>intoPath</code> 中，您还可以使用 <code>${i}</code>风格的路径匹配符来表示<code>from</code>子句中的部分路径。</strong></p> <p>比如，对于路径<code>root.sg1.d1.v1</code>而言，<code>${1}</code>表示<code>sg1</code>，<code>${2}</code>表示<code>d1</code>，<code>${3}</code>表示<code>v1</code>。</p> <ul><li><p>例子：</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> ${<span class="token number">1</span>}_t1<span class="token punctuation">,</span> ${<span class="token number">2</span>}<span class="token punctuation">,</span> root<span class="token punctuation">.</span>${<span class="token number">2</span>}<span class="token punctuation">.</span>${<span class="token number">1</span>}<span class="token punctuation">.</span>t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>这等价于</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>sg_t1<span class="token punctuation">,</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>d1<span class="token punctuation">,</span> root<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li></ul> <p><strong>您可以通过关键词 <code>ALIGNED</code> 指定 <code>intoPath</code>（目标序列）是否为一个对齐时间序列。</strong></p> <p>当目标序列存在时，您需要保证源序列和目标时间序列的类型匹配。</p> <p>当目标序列不存在时，系统将自动创建一个新的目标对齐时间序列。</p> <ul><li><p>例子：</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s2<span class="token punctuation">,</span> s3 |
| <span class="token keyword">into</span> aligned root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d2<span class="token punctuation">.</span>t1<span class="token punctuation">,</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d2<span class="token punctuation">.</span>t2<span class="token punctuation">,</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d2<span class="token punctuation">.</span>t3 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li></ul> <h3 id="支持写回的查询类型"><a href="#支持写回的查询类型" class="header-anchor">#</a> 支持写回的查询类型</h3> <p><strong>注意，除了下述类型的查询，其余类型的查询（如<code>LAST</code>查询和原始聚合查询）都不被支持。</strong></p> <ul><li><p>原始序列查询</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> t1<span class="token punctuation">,</span> t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li> <li><p>时间序列生成函数查询（UDF查询）</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> sin<span class="token punctuation">(</span>s2<span class="token punctuation">)</span> |
| <span class="token keyword">into</span> t1<span class="token punctuation">,</span> t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li> <li><p>数学表达式查询</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> sin<span class="token punctuation">(</span>s2<span class="token punctuation">)</span><span class="token punctuation">,</span> s1 <span class="token operator">+</span> s3 |
| <span class="token keyword">into</span> t1<span class="token punctuation">,</span> t2<span class="token punctuation">,</span> t3 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li> <li><p>嵌套查询</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> <span class="token operator">-</span>s1<span class="token punctuation">,</span> sin<span class="token punctuation">(</span>cos<span class="token punctuation">(</span>tan<span class="token punctuation">(</span>s1 <span class="token operator">+</span> s2 <span class="token operator">*</span> s3<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">+</span> cos<span class="token punctuation">(</span>s3<span class="token punctuation">)</span><span class="token punctuation">,</span> top_k<span class="token punctuation">(</span>s1 <span class="token operator">+</span> s3<span class="token punctuation">,</span> <span class="token string">'k'</span><span class="token operator">=</span><span class="token string">'1'</span><span class="token punctuation">)</span> |
| <span class="token keyword">into</span> t1<span class="token punctuation">,</span> t2<span class="token punctuation">,</span> t3 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li> <li><p>Fill 查询</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1 |
| <span class="token keyword">into</span> fill_s1 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">=</span> <span class="token number">10</span> |
| fill<span class="token punctuation">(</span><span class="token keyword">float</span> <span class="token punctuation">[</span>linear<span class="token punctuation">,</span> <span class="token number">1</span>ms<span class="token punctuation">,</span> <span class="token number">1</span>ms<span class="token punctuation">]</span><span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div></li> <li><p>Group By 查询</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> <span class="token function">count</span><span class="token punctuation">(</span>s1<span class="token punctuation">)</span> |
| <span class="token keyword">into</span> group_by_s1 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| <span class="token keyword">group</span> <span class="token keyword">by</span> <span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">1</span>ms<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div></li> <li><p>Group By Fill 查询</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> last_value<span class="token punctuation">(</span>s1<span class="token punctuation">)</span> |
| <span class="token keyword">into</span> group_by_fill_s1 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| <span class="token keyword">group</span> <span class="token keyword">by</span> <span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token number">1</span>ms<span class="token punctuation">)</span> |
| fill <span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">[</span>PREVIOUS<span class="token punctuation">]</span><span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div></li></ul> <h3 id="支持写回的查询子句"><a href="#支持写回的查询子句" class="header-anchor">#</a> 支持写回的查询子句</h3> <p><strong>注意，除了下述子句，其余查询子句（如 <code>DESC</code> / <code>SOFFSET</code> 等）都不被支持。</strong></p> <ul><li><p>支持值过滤</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> t1<span class="token punctuation">,</span> t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| <span class="token keyword">where</span> s1 <span class="token operator">></span> <span class="token number">0</span> <span class="token operator">and</span> s2 <span class="token operator"><</span> <span class="token number">0</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div></li> <li><p>支持时间过滤</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> t1<span class="token punctuation">,</span> t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">></span> <span class="token number">0</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div></li> <li><p>LIMIT / OFFSET</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> s1<span class="token punctuation">,</span> s1 |
| <span class="token keyword">into</span> t1<span class="token punctuation">,</span> t2 |
| <span class="token keyword">from</span> root<span class="token punctuation">.</span>sg<span class="token punctuation">.</span>d1 |
| <span class="token keyword">limit</span> <span class="token number">5</span> <span class="token keyword">offset</span> <span class="token number">1000</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div></li></ul> <h3 id="其他限制"><a href="#其他限制" class="header-anchor">#</a> 其他限制</h3> <ul><li><code>select</code>子句中的源序列和<code>into</code>子句中的目标序列数量必须相同</li> <li><code>select</code>子句不支持带 <code>*</code>/<code>**</code> 查询</li> <li><code>into</code>子句中的目标序列不必预先创建（可使用自动创建schema功能），但是当<code>into</code>子句中的目标序列已存在时，您需要保证<code>select</code>子句中的源序列和<code>into</code>子句中的目标序列的数据类型一致</li> <li><code>into</code>子句中的目标序列必须是互不相同的</li> <li><code>from</code>子句只允许有一列序列前缀</li> <li><code>from</code>子句不支持带 <code>*</code>/<code>**</code></li> <li>由于时间序列生成函数查询（UDF查询）/ 数学表达式查询 / 嵌套查询 尚不支持对齐时间序列（Aligned Timeseries），所以如果您在<code>select</code>子句中使用了上述查询，并且对应操作数包含对齐时间序列，会提示错误</li></ul> <h2 id="权限"><a href="#权限" class="header-anchor">#</a> 权限</h2> <p>用户必须有下列权限才能正常执行查询写回语句：</p> <ul><li>所有 <code>select</code> 子句中源序列的 <code>READ_TIMESERIES</code> 权限</li> <li>所有 <code>into</code> 子句中目标序列 <code>INSERT_TIMESERIES</code> 权限</li></ul> <p>更多用户权限相关的内容，请参考<a href="/zh/UserGuide/Master/Administration-Management/Administration.html">权限管理语句</a>。</p> <h2 id="配置参数"><a href="#配置参数" class="header-anchor">#</a> 配置参数</h2> <ul><li><code>select_into_insert_tablet_plan_row_limit</code>：执行 select-into 语句时，一个 insert-tablet-plan 中可以处理的最大行数。 默认为 10000。</li></ul></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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