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--><h1 id="logical-operators" tabindex="-1"><a class="header-anchor" href="#logical-operators" aria-hidden="true">#</a> Logical Operators</h1><h2 id="unary-logical-operators" tabindex="-1"><a class="header-anchor" href="#unary-logical-operators" aria-hidden="true">#</a> Unary Logical Operators</h2><p>Supported operator <code>!</code></p><p>Supported input data types: <code>BOOLEAN</code></p><p>Output data type: <code>BOOLEAN</code></p><p>Hint: the priority of <code>!</code> is the same as <code>-</code>. Remember to use brackets to modify priority.</p><h2 id="binary-logical-operators" tabindex="-1"><a class="header-anchor" href="#binary-logical-operators" aria-hidden="true">#</a> Binary Logical Operators</h2><p>Supported operators AND:<code>and</code>,<code>&amp;</code>, <code>&amp;&amp;</code>; OR:<code>or</code>,<code>|</code>,<code>||</code></p><p>Supported input data types: <code>BOOLEAN</code></p><p>Output data type: <code>BOOLEAN</code></p><p>Note: Only when the left operand and the right operand under a certain timestamp are both <code>BOOLEAN</code> type, the binary logic operation will have an output value.</p><p><strong>Example:</strong></p><div class="language-sql line-numbers-mode" data-ext="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"><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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