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class="vp-toc-header">此页内容<button type="button" class="print-button" title="打印"><svg xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button><div class="arrow end"></div></div><div class="vp-toc-wrapper"><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#逻辑运算符">逻辑运算符</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#一元逻辑运算符">一元逻辑运算符</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#二元逻辑运算符">二元逻辑运算符</a></li><!----><!--]--></ul></li><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h2 id="逻辑运算符" tabindex="-1"><a class="header-anchor" href="#逻辑运算符"><span>逻辑运算符</span></a></h2><h3 id="一元逻辑运算符" tabindex="-1"><a class="header-anchor" href="#一元逻辑运算符"><span>一元逻辑运算符</span></a></h3><ul><li>支持运算符：<code>!</code></li><li>输入数据类型：<code>BOOLEAN</code>。</li><li>输出数据类型：<code>BOOLEAN</code>。</li><li>注意：<code>!</code>的优先级很高，记得使用括号调整优先级。</li></ul><h3 id="二元逻辑运算符" tabindex="-1"><a class="header-anchor" href="#二元逻辑运算符"><span>二元逻辑运算符</span></a></h3><ul><li><p>支持运算符</p><ul><li>AND:<code>and</code>,<code>&amp;</code>, <code>&amp;&amp;</code></li><li>OR:<code>or</code>,<code>|</code>,<code>||</code></li></ul></li><li><p>输入数据类型：<code>BOOLEAN</code>。</p></li><li><p>返回类型 <code>BOOLEAN</code>。</p></li><li><p>注意：当某个时间戳下左操作数和右操作数都为<code>BOOLEAN</code>类型时，二元逻辑操作才会有输出结果。</p></li></ul><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">select</span> a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> a <span class="token operator">&gt;</span> <span class="token number">10</span><span class="token punctuation">,</span> a <span class="token operator">&lt;=</span> b<span class="token punctuation">,</span> <span class="token operator">!</span><span class="token punctuation">(</span>a <span class="token operator">&lt;=</span> b<span class="token punctuation">)</span><span class="token punctuation">,</span> a <span class="token operator">&gt;</span> <span class="token number">10</span> <span class="token operator">&amp;&amp;</span> a <span class="token operator">&gt;</span> b <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>运行结果</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; select a, b, a &gt; 10, a &lt;= b, !(a &lt;= b), a &gt; 10 &amp;&amp; a &gt; b from root.test;
+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+
|                         Time|root.test.a|root.test.b|root.test.a &gt; 10|root.test.a &lt;= root.test.b|!root.test.a &lt;= root.test.b|(root.test.a &gt; 10) &amp; (root.test.a &gt; root.test.b)|
+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+
|1970-01-01T08:00:00.001+08:00|         23|       10.0|            true|                     false|                       true|                                            true|
|1970-01-01T08:00:00.002+08:00|         33|       21.0|            true|                     false|                       true|                                            true|
|1970-01-01T08:00:00.004+08:00|         13|       15.0|            true|                      true|                      false|                                           false|
|1970-01-01T08:00:00.005+08:00|         26|        0.0|            true|                     false|                       true|                                            true|
|1970-01-01T08:00:00.008+08:00|          1|       22.0|           false|                      true|                      false|                                           false|
|1970-01-01T08:00:00.010+08:00|         23|       12.0|            true|                     false|                       true|                                            true|
+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+
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