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href="/zh/UserGuide/V0.13.x/Query-Data/Select-Expression.html" class="nav-link sidebar-link sidebar-page" aria-label="选择表达式"><!---->选择表达式<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Query-Data/Query-Filter.html" class="nav-link sidebar-link sidebar-page" aria-label="查询过滤条件"><!---->查询过滤条件<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Query-Data/Pagination.html" class="nav-link sidebar-link sidebar-page" aria-label="查询结果分页"><!---->查询结果分页<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Query-Data/Result-Format.html" class="nav-link sidebar-link sidebar-page" aria-label="查询结果对齐格式"><!---->查询结果对齐格式<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Query-Data/Aggregate-Query.html" class="nav-link sidebar-link sidebar-page" aria-label="聚合查询"><!---->聚合查询<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Query-Data/Last-Query.html" class="nav-link sidebar-link sidebar-page" aria-label="最新点查询"><!---->最新点查询<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Query-Data/Fill-Null-Value.html" class="nav-link sidebar-link sidebar-page" aria-label="空值填充"><!---->空值填充<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-current="page" href="/zh/UserGuide/V0.13.x/Query-Data/Without-Null.html" class="router-link-active router-link-exact-active nav-link active sidebar-link sidebar-page active" aria-label="空值过滤"><!---->空值过滤<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Query-Data/Without-Null.html#结果集空值过滤" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="结果集空值过滤"><!---->结果集空值过滤<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Query-Data/Without-Null.html#不指定列" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="不指定列"><!---->不指定列<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Query-Data/Without-Null.html#指定列" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="指定列"><!---->指定列<!----></a><ul class="sidebar-sub-headers"></ul></li></ul></li></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Query-Data/Tracing-Tool.html" class="nav-link sidebar-link sidebar-page" aria-label="查询性能追踪"><!---->查询性能追踪<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li></ul></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">数据处理</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">权限管理</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">运维工具</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">系统集成</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">UDF 资料库</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">参考</span><span class="arrow end"></span></button><!----></section></li></ul><!--[--><!----><!--]--></aside><!--[--><main class="page" id="main-content"><!--[--><!----><nav class="breadcrumb disable"></nav><div class="page-title"><h1><!----></h1><div class="page-info"><!----><!----><!----><!----><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 5 分钟</span><meta property="timeRequired" content="PT5M"></span><!----><!----></div><hr></div><div class="toc-place-holder"><aside id="toc"><!--[--><!----><!--]--><div class="toc-header">此页内容<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 aria-current="page" href="/zh/UserGuide/V0.13.x/Query-Data/Without-Null.html#结果集空值过滤" class="router-link-active router-link-exact-active toc-link level2">结果集空值过滤</a></li><ul class="toc-list"><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Query-Data/Without-Null.html#不指定列" class="router-link-active router-link-exact-active toc-link level3">不指定列</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Query-Data/Without-Null.html#指定列" class="router-link-active router-link-exact-active toc-link level3">指定列</a></li><!----><!--]--></ul><!--]--></ul></div><!--[--><!----><!--]--></aside></div><!----><div 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| --><h2 id="结果集空值过滤" tabindex="-1"><a class="header-anchor" href="#结果集空值过滤" aria-hidden="true">#</a> 结果集空值过滤</h2><p>在实际应用中，用户可能希望对查询的结果集中某些存在空值的行进行过滤。在 IoTDB 中，可以使用 <code>WITHOUT NULL</code> 子句对结果集中的空值进行过滤，有两种过滤策略：<code>WITHOUT NULL ANY</code>和<code>WITHOUT NULL ALL</code>。不仅如此， <code>WITHOUT NULL</code> 子句支持指定相应列进行过滤。</p><blockquote><p>WITHOUT NULL ANY: 指定的列集中，存在一列为NULL,则满足条件进行过滤</p><p>WITHOUT NULL ALL: 指定的列集中，所有列都为NULL,才满足条件进行过滤</p></blockquote><h3 id="不指定列" tabindex="-1"><a class="header-anchor" href="#不指定列" aria-hidden="true">#</a> 不指定列</h3><blockquote><p>默认就是对结果集中的所有列生效，即指定的列集为结果集中的所有列</p></blockquote><ol><li>在下列查询中，如果结果集中某一行任意一列为 null，则过滤掉该行；即获得的结果集不包含任何空值。</li></ol><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><span class="token operator">*</span><span class="token operator">*</span> <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator"><=</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>T00:<span class="token number">01</span>:<span class="token number">00</span> WITHOUT <span class="token boolean">NULL</span> <span class="token keyword">ANY</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ol start="2"><li>在下列查询中，如果结果集的某一行所有列都为 null，则过滤掉该行；即获得的结果集不包含所有值都为 null 的行。</li></ol><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><span class="token operator">*</span><span class="token operator">*</span> <span class="token keyword">where</span> <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">2</span>ms<span class="token punctuation">)</span> WITHOUT <span class="token boolean">NULL</span> <span class="token keyword">ALL</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="指定列" tabindex="-1"><a class="header-anchor" href="#指定列" aria-hidden="true">#</a> 指定列</h3><blockquote><p>只对指定的列集生效</p></blockquote><p>使用 <code>WITHOUT NULL</code>子句对结果集中指定列名的空值进行过滤，下面是一些例子及其说明:</p><blockquote><p>注意，如果指定的列在当前元数据里不存在则会直接过滤掉，这与目前查询列的输出结果是一致的; 如果指定的列存在，但与结果集中输出的列名不匹配，则会报错: <code>The without null columns don't match the columns queried.If has alias, please use the alias.</code></p></blockquote><p>比如下面的例子</p><ol><li>比如<code>without null</code>指定的列集中<code>root.test.sg1.s1</code>列在元数据中存在，<code>root.test.sg1.usag</code>列在元数据不存在，则下面查询的without null子句的作用相当于without null all(s1)</li></ol><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>test<span class="token punctuation">.</span>sg1 without <span class="token boolean">null</span> <span class="token keyword">all</span> <span class="token punctuation">(</span>s1<span class="token punctuation">,</span> usag<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ol start="2"><li>比如<code>without null</code>指定的列集中<code>root.test.sg1.s2</code>列在元数据中存在，但查询的结果集中输出列不包括，所以会报错:<code>The without null columns don't match the columns queried.If has alias, please use the alias.</code></li></ol><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> s1 <span class="token operator">+</span> s2<span class="token punctuation">,</span> s1 <span class="token operator">-</span> s2<span class="token punctuation">,</span> s1 <span class="token operator">*</span> s2<span class="token punctuation">,</span> s1 <span class="token operator">/</span> s2<span class="token punctuation">,</span> s1 <span class="token operator">%</span> s2 <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 without <span class="token boolean">null</span> <span class="token keyword">all</span> <span class="token punctuation">(</span>s1<span class="token operator">+</span>s2<span class="token punctuation">,</span> s2<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="原始数据查询" tabindex="-1"><a class="header-anchor" href="#原始数据查询" aria-hidden="true">#</a> 原始数据查询</h4><ol><li>如果查询的结果集中, root.ln.sg1.s1这一列如果为null,则过滤掉该行</li></ol><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>sg1 WITHOUT <span class="token boolean">NULL</span> <span class="token keyword">ANY</span><span class="token punctuation">(</span>s1<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ol start="2"><li>如果查询的结果集中, root.ln.sg1.s1和root.ln.sg1.s2中只要存在至少一列为null,则过滤掉该行</li></ol><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>sg1 WITHOUT <span class="token boolean">NULL</span> <span class="token keyword">ANY</span><span class="token punctuation">(</span>s1<span class="token punctuation">,</span> s2<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ol start="3"><li>如果查询的结果集中, 只要root.ln.sg1.s1和root.ln.sg1.s2这两列都为null,则过滤掉该行</li></ol><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>sg1 WITHOUT <span class="token boolean">NULL</span> <span class="token keyword">ALL</span><span class="token punctuation">(</span>s1<span class="token punctuation">,</span> s2<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="带表达式查询" tabindex="-1"><a class="header-anchor" href="#带表达式查询" aria-hidden="true">#</a> 带表达式查询</h4><p>指定的列可以为表达式</p><ol><li>计算s2+s4和s2这两列是否都为null,如果是则过滤</li></ol><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> s2<span class="token punctuation">,</span> <span class="token operator">-</span> s2<span class="token punctuation">,</span> s4<span class="token punctuation">,</span> <span class="token operator">+</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">+</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">-</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">*</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">/</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">%</span> s4 <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 without <span class="token boolean">null</span> <span class="token keyword">all</span> <span class="token punctuation">(</span>s2<span class="token operator">+</span>s4<span class="token punctuation">,</span> s2<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ol start="2"><li>计算s2+s4和s2这两列是否至少有一列为null,如果是则过滤</li></ol><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> s2<span class="token punctuation">,</span> <span class="token operator">-</span> s2<span class="token punctuation">,</span> s4<span class="token punctuation">,</span> <span class="token operator">+</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">+</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">-</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">*</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">/</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">%</span> s4 <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 without <span class="token boolean">null</span> <span class="token keyword">any</span> <span class="token punctuation">(</span>s2<span class="token operator">+</span>s4<span class="token punctuation">,</span> s2<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="别名" tabindex="-1"><a class="header-anchor" href="#别名" aria-hidden="true">#</a> 别名</h4><p>指定的列可以为别名</p><ol><li>计算t2和t1这两列是否都为null,如果是则过滤</li></ol><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> s2 <span class="token keyword">as</span> t1<span class="token punctuation">,</span> <span class="token operator">-</span> s2<span class="token punctuation">,</span> s4<span class="token punctuation">,</span> <span class="token operator">+</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">+</span> s4 <span class="token keyword">as</span> t2<span class="token punctuation">,</span> s2 <span class="token operator">-</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">*</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">/</span> s4<span class="token punctuation">,</span> s2 <span class="token operator">%</span> s4 <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 without <span class="token boolean">null</span> <span class="token keyword">all</span> <span class="token punctuation">(</span>t2<span class="token punctuation">,</span> t1<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><div class="language-sql line-numbers-mode" data-ext="sql"><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 operator">+</span> cos<span class="token punctuation">(</span>s2<span class="token punctuation">)</span> <span class="token keyword">as</span> t1<span class="token punctuation">,</span> cos<span class="token punctuation">(</span>sin<span class="token punctuation">(</span>s2 <span class="token operator">+</span> s4<span class="token punctuation">)</span> <span class="token operator">+</span> s2<span class="token punctuation">)</span> <span class="token keyword">as</span> t2 <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 without <span class="token boolean">null</span> <span class="token keyword">all</span> <span class="token punctuation">(</span>t1<span class="token punctuation">,</span> t2<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ol start="2"><li>当你指定了别名，如果在without null指定的列集中再使用原始列名，则会报错：<code>The without null columns don't match the columns queried.If has alias, please use the alias.</code> 比如下面同时使用了tan(s1)和t</li></ol><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> s1 <span class="token keyword">as</span> d<span class="token punctuation">,</span> sin<span class="token punctuation">(</span>s1<span class="token punctuation">)</span><span class="token punctuation">,</span> cos<span class="token punctuation">(</span>s1<span class="token punctuation">)</span><span class="token punctuation">,</span> tan<span class="token punctuation">(</span>s1<span class="token punctuation">)</span> <span class="token keyword">as</span> t<span class="token punctuation">,</span> s2 <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 without <span class="token boolean">null</span> <span class="token keyword">all</span><span class="token punctuation">(</span>d<span class="token punctuation">,</span> tan<span class="token punctuation">(</span>s1<span class="token punctuation">)</span><span class="token punctuation">,</span> t<span class="token punctuation">)</span> <span class="token keyword">limit</span> <span class="token number">5</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="带函数查询" tabindex="-1"><a class="header-anchor" href="#带函数查询" aria-hidden="true">#</a> 带函数查询</h4><div class="language-sql line-numbers-mode" data-ext="sql"><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 operator">+</span> cos<span class="token punctuation">(</span>s2<span class="token punctuation">)</span><span class="token punctuation">,</span> cos<span class="token punctuation">(</span>sin<span class="token punctuation">(</span>s2 <span class="token operator">+</span> s4<span class="token punctuation">)</span> <span class="token operator">+</span> s2<span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 without <span class="token boolean">null</span> <span class="token keyword">all</span> <span class="token punctuation">(</span>sin<span class="token punctuation">(</span>s2<span class="token punctuation">)</span> <span class="token operator">+</span> cos<span class="token punctuation">(</span>s2<span class="token punctuation">)</span><span class="token punctuation">,</span> cos<span class="token punctuation">(</span>sin<span class="token punctuation">(</span>s2 <span class="token operator">+</span> s4<span class="token punctuation">)</span> <span class="token operator">+</span> s2<span class="token punctuation">)</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="按设备对齐查询" tabindex="-1"><a class="header-anchor" href="#按设备对齐查询" aria-hidden="true">#</a> 按设备对齐查询</h4><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> last_value<span class="token punctuation">(</span><span class="token operator">*</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 <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">2</span>ms<span class="token punctuation">)</span> without <span class="token boolean">null</span> <span class="token keyword">all</span><span class="token punctuation">(</span>last_value<span class="token punctuation">(</span>s2<span class="token punctuation">)</span><span class="token punctuation">,</span> last_value<span class="token punctuation">(</span>s3<span class="token punctuation">)</span><span class="token punctuation">)</span> align <span class="token keyword">by</span> device |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>结果示例如下：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>IoTDB> select last_value(*) from root.sg1.* group by([1,10), 2ms) without null all(last_value(s2), last_value(s3)) align by device |
| +-----------------------------+-----------+--------------+--------------+--------------+ |
| | Time| Device|last_value(s1)|last_value(s2)|last_value(s3)| |
| +-----------------------------+-----------+--------------+--------------+--------------+ |
| |1970-01-01T08:00:00.001+08:00|root.sg1.d1| 1.0| 2.0| null| |
| |1970-01-01T08:00:00.003+08:00|root.sg1.d1| 3.0| 4.0| null| |
| |1970-01-01T08:00:00.001+08:00|root.sg1.d2| 1.0| 1.0| 1.0| |
| +-----------------------------+-----------+--------------+--------------+--------------+ |
| Total line number = 3 |
| It costs 0.007s |
| </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 class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>指定的列名是与输出结果的列名对应，目前<code>without null</code>子句不支持指定某设备的某列，会报错:<code>The without null columns don't match the columns queried.If has alias, please use the alias.</code> 比如下面这个查询例子,指定last_value(root.sg1.d1.s3)为null的行进行过滤，目前是不支持的。</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> last_value<span class="token punctuation">(</span><span class="token operator">*</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 <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">2</span>ms<span class="token punctuation">)</span> without <span class="token boolean">null</span> <span class="token keyword">all</span><span class="token punctuation">(</span>last_value<span class="token punctuation">(</span><span class="token identifier"><span class="token punctuation">`</span>root.sg1.d1.s3<span class="token punctuation">`</span></span><span class="token punctuation">)</span><span class="token punctuation">)</span> align <span class="token keyword">by</span> device |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="聚合查询" tabindex="-1"><a class="header-anchor" href="#聚合查询" aria-hidden="true">#</a> 聚合查询</h4><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> <span class="token function">avg</span><span class="token punctuation">(</span>s4<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">sum</span><span class="token punctuation">(</span>s2<span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 <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">2</span>ms<span class="token punctuation">)</span> without <span class="token boolean">null</span> <span class="token keyword">all</span><span class="token punctuation">(</span><span class="token function">sum</span><span class="token punctuation">(</span>s2<span class="token punctuation">)</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> <span class="token function">avg</span><span class="token punctuation">(</span>s4<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">sum</span><span class="token punctuation">(</span>s2<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">count</span><span class="token punctuation">(</span>s3<span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg1 <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">2</span>ms<span class="token punctuation">)</span> without <span class="token boolean">null</span> <span class="token keyword">all</span><span class="token punctuation">(</span><span class="token function">avg</span><span class="token punctuation">(</span>s4<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">sum</span><span class="token punctuation">(</span>s2<span class="token punctuation">)</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="指定全路径列名" tabindex="-1"><a class="header-anchor" href="#指定全路径列名" aria-hidden="true">#</a> 指定全路径列名</h4><p>假设下面的查询输出的结果列为"root.test.sg1.s2", "root.test.sg1.s3", "root.test.sg2.s2", "root.test.sg2.s3"四个，可以使用全路径名指定相应列进行过滤，比如下面的例子：</p><ol><li>指定<code>root.test.sg1.s2</code>, <code>root.test.sg2.s3</code>两列都为null则过滤</li></ol><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> s2<span class="token punctuation">,</span> s3 <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> without <span class="token boolean">null</span> <span class="token keyword">all</span><span class="token punctuation">(</span><span class="token identifier"><span class="token punctuation">`</span>root.test.sg1.s2<span class="token punctuation">`</span></span><span class="token punctuation">,</span> <span class="token identifier"><span class="token punctuation">`</span>root.test.sg2.s3<span class="token punctuation">`</span></span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ol start="2"><li>指定<code>root.test.sg1.s2</code>, <code>root.test.sg1.s3</code>, <code>root.test.sg2.s3</code>三列都为null则过滤</li></ol><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> s2<span class="token punctuation">,</span> s3 <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> without <span class="token boolean">null</span> <span class="token keyword">all</span><span class="token punctuation">(</span><span class="token identifier"><span class="token punctuation">`</span>root.test.sg1.s2<span class="token punctuation">`</span></span><span class="token punctuation">,</span> s3<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="对齐序列查询" tabindex="-1"><a class="header-anchor" href="#对齐序列查询" aria-hidden="true">#</a> 对齐序列查询</h4><ol><li>可以指定<code>without null</code> 子句后的列名为对齐序列列名</li></ol><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> ALIGNED TIMESERIES root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>sg3<span class="token punctuation">(</span>s5 INT32<span class="token punctuation">,</span> s6 <span class="token keyword">BOOLEAN</span><span class="token punctuation">,</span> s7 <span class="token keyword">DOUBLE</span><span class="token punctuation">,</span> s8 INT32<span class="token punctuation">)</span> |
| <span class="token keyword">select</span> sg1<span class="token punctuation">.</span>s1<span class="token punctuation">,</span> sg1<span class="token punctuation">.</span>s2<span class="token punctuation">,</span> sg2<span class="token punctuation">.</span>s3<span class="token punctuation">,</span> sg3<span class="token punctuation">.</span><span class="token operator">*</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test without <span class="token boolean">null</span> <span class="token keyword">all</span> <span class="token punctuation">(</span>sg3<span class="token punctuation">.</span>s5<span class="token punctuation">,</span> sg3<span class="token punctuation">.</span>s6<span class="token punctuation">,</span> sg2<span class="token punctuation">.</span>s3<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></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/rel/0.13/docs/zh/UserGuide/Query-Data/Without-Null.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></footer><nav class="page-nav"><a href="/zh/UserGuide/V0.13.x/Query-Data/Fill-Null-Value.html" class="nav-link prev" aria-label="空值填充"><div class="hint"><span class="arrow start"></span>上一页</div><div class="link"><!---->空值填充</div></a><a href="/zh/UserGuide/V0.13.x/Query-Data/Tracing-Tool.html" class="nav-link next" aria-label="查询性能追踪"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">查询性能追踪<!----></div></a></nav><!----><!----><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">rel/0.13</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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