import{_ as n,o as s,c as a,a as e,f as t}from"./app-SFHDkVtH.js";const p={},o=t(`<h1 id="聚合函数" tabindex="-1"><a class="header-anchor" href="#聚合函数" aria-hidden="true">#</a> 聚合函数</h1><p>聚合函数是多对一函数。它们对一组值进行聚合计算，得到单个聚合结果。</p><p>除了 <code>COUNT()</code>, <code>COUNT_IF()</code>之外，其他所有聚合函数都忽略空值，并在没有输入行或所有值为空时返回空值。 例如，<code>SUM()</code> 返回 null 而不是零，而 <code>AVG()</code> 在计数中不包括 null 值。</p><p>IoTDB 支持的聚合函数如下：</p><table><thead><tr><th>函数名</th><th>功能描述</th><th>允许的输入类型</th><th>必要的属性参数</th><th>输出类型</th></tr></thead><tbody><tr><td>SUM</td><td>求和。</td><td>INT32 INT64 FLOAT DOUBLE</td><td>无</td><td>DOUBLE</td></tr><tr><td>COUNT</td><td>计算数据点数。</td><td>所有类型</td><td>无</td><td>INT64</td></tr><tr><td>AVG</td><td>求平均值。</td><td>INT32 INT64 FLOAT DOUBLE</td><td>无</td><td>DOUBLE</td></tr><tr><td>EXTREME</td><td>求具有最大绝对值的值。如果正值和负值的最大绝对值相等，则返回正值。</td><td>INT32 INT64 FLOAT DOUBLE</td><td>无</td><td>与输入类型一致</td></tr><tr><td>MAX_VALUE</td><td>求最大值。</td><td>INT32 INT64 FLOAT DOUBLE</td><td>无</td><td>与输入类型一致</td></tr><tr><td>MIN_VALUE</td><td>求最小值。</td><td>INT32 INT64 FLOAT DOUBLE</td><td>无</td><td>与输入类型一致</td></tr><tr><td>FIRST_VALUE</td><td>求时间戳最小的值。</td><td>所有类型</td><td>无</td><td>与输入类型一致</td></tr><tr><td>LAST_VALUE</td><td>求时间戳最大的值。</td><td>所有类型</td><td>无</td><td>与输入类型一致</td></tr><tr><td>MAX_TIME</td><td>求最大时间戳。</td><td>所有类型</td><td>无</td><td>Timestamp</td></tr><tr><td>MIN_TIME</td><td>求最小时间戳。</td><td>所有类型</td><td>无</td><td>Timestamp</td></tr><tr><td>COUNT_IF</td><td>求数据点连续满足某一给定条件，且满足条件的数据点个数（用keep表示）满足指定阈值的次数。</td><td>BOOLEAN</td><td><code>[keep &gt;=/&gt;/=/!=/&lt;/&lt;=]threshold</code>：被指定的阈值或阈值条件，若只使用<code>threshold</code>则等价于<code>keep &gt;= threshold</code>,<code>threshold</code>类型为<code>INT64</code> <br> <code>ignoreNull</code>：可选，默认为<code>true</code>；为<code>true</code>表示忽略null值，即如果中间出现null值，直接忽略，不会打断连续性；为<code>false</code>表示不忽略null值，即如果中间出现null值，会打断连续性</td><td>INT64</td></tr><tr><td>TIME_DURATION</td><td>求某一列最大一个不为NULL的值所在时间戳与最小一个不为NULL的值所在时间戳的时间戳差</td><td>所有类型</td><td>无</td><td>INT64</td></tr><tr><td>MODE</td><td>求众数。注意：<br>1.输入序列的不同值个数过多时会有内存异常风险; <br>2.如果所有元素出现的频次相同，即没有众数，则返回对应时间戳最小的值; <br>3.如果有多个众数，则返回对应时间戳最小的众数。</td><td>所有类型</td><td>无</td><td>与输入类型一致</td></tr><tr><td>COUNT_TIME</td><td>查询结果集的时间戳的数量。与 align by device 搭配使用时，得到的结果是每个设备的结果集的时间戳的数量。</td><td>所有类型，输入参数只能为*</td><td>无</td><td>INT64</td></tr></tbody></table><h2 id="count-if" tabindex="-1"><a class="header-anchor" href="#count-if" aria-hidden="true">#</a> COUNT_IF</h2><h3 id="语法" tabindex="-1"><a class="header-anchor" href="#语法" aria-hidden="true">#</a> 语法</h3><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>count_if<span class="token punctuation">(</span>predicate<span class="token punctuation">,</span> <span class="token punctuation">[</span>keep <span class="token operator">&gt;=</span><span class="token operator">/</span><span class="token operator">&gt;</span><span class="token operator">/</span><span class="token operator">=</span><span class="token operator">/</span><span class="token operator">!=</span><span class="token operator">/</span><span class="token operator">&lt;</span><span class="token operator">/</span><span class="token operator">&lt;=</span><span class="token punctuation">]</span>threshold<span class="token punctuation">[</span><span class="token punctuation">,</span> <span class="token string">&#39;ignoreNull&#39;</span><span class="token operator">=</span><span class="token string">&#39;true/false&#39;</span><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><p>predicate: 返回类型为<code>BOOLEAN</code>的合法表达式</p><p>threshold 及 ignoreNull 用法见上表</p><blockquote><p>注意: count_if 当前暂不支持与 group by time 的 SlidingWindow 一起使用</p></blockquote><h3 id="使用示例" tabindex="-1"><a class="header-anchor" href="#使用示例" aria-hidden="true">#</a> 使用示例</h3><h4 id="原始数据" tabindex="-1"><a class="header-anchor" href="#原始数据" aria-hidden="true">#</a> 原始数据</h4><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-------------+-------------+
|                         Time|root.db.d1.s1|root.db.d1.s2|
+-----------------------------+-------------+-------------+
|1970-01-01T08:00:00.001+08:00|            0|            0|
|1970-01-01T08:00:00.002+08:00|         null|            0|
|1970-01-01T08:00:00.003+08:00|            0|            0|
|1970-01-01T08:00:00.004+08:00|            0|            0|
|1970-01-01T08:00:00.005+08:00|            1|            0|
|1970-01-01T08:00:00.006+08:00|            1|            0|
|1970-01-01T08:00:00.007+08:00|            1|            0|
|1970-01-01T08:00:00.008+08:00|            0|            0|
|1970-01-01T08:00:00.009+08:00|            0|            0|
|1970-01-01T08:00:00.010+08:00|            0|            0|
+-----------------------------+-------------+-------------+
</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 class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h4 id="不使用ignorenull参数-忽略null" tabindex="-1"><a class="header-anchor" href="#不使用ignorenull参数-忽略null" aria-hidden="true">#</a> 不使用ignoreNull参数(忽略null)</h4><p>SQL:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> count_if<span class="token punctuation">(</span>s1<span class="token operator">=</span><span class="token number">0</span> <span class="token operator">&amp;</span> s2<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">,</span> count_if<span class="token punctuation">(</span>s1<span class="token operator">=</span><span class="token number">1</span> <span class="token operator">&amp;</span> s2<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d1
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>输出:</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+--------------------------------------------------+--------------------------------------------------+
|count_if(root.db.d1.s1 = 0 &amp; root.db.d1.s2 = 0, 3)|count_if(root.db.d1.s1 = 1 &amp; root.db.d1.s2 = 0, 3)|
+--------------------------------------------------+--------------------------------------------------+
|                                                 2|                                                 1|
+--------------------------------------------------+--------------------------------------------------
</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></div><h4 id="使用ignorenull参数" tabindex="-1"><a class="header-anchor" href="#使用ignorenull参数" aria-hidden="true">#</a> 使用ignoreNull参数</h4><p>SQL:</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> count_if<span class="token punctuation">(</span>s1<span class="token operator">=</span><span class="token number">0</span> <span class="token operator">&amp;</span> s2<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token string">&#39;ignoreNull&#39;</span><span class="token operator">=</span><span class="token string">&#39;false&#39;</span><span class="token punctuation">)</span><span class="token punctuation">,</span> count_if<span class="token punctuation">(</span>s1<span class="token operator">=</span><span class="token number">1</span> <span class="token operator">&amp;</span> s2<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token string">&#39;ignoreNull&#39;</span><span class="token operator">=</span><span class="token string">&#39;false&#39;</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d1
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>输出:</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+------------------------------------------------------------------------+------------------------------------------------------------------------+
|count_if(root.db.d1.s1 = 0 &amp; root.db.d1.s2 = 0, 3, &quot;ignoreNull&quot;=&quot;false&quot;)|count_if(root.db.d1.s1 = 1 &amp; root.db.d1.s2 = 0, 3, &quot;ignoreNull&quot;=&quot;false&quot;)|
+------------------------------------------------------------------------+------------------------------------------------------------------------+
|                                                                       1|                                                                       1|
+------------------------------------------------------------------------+------------------------------------------------------------------------+
</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></div><h2 id="time-duration" tabindex="-1"><a class="header-anchor" href="#time-duration" aria-hidden="true">#</a> TIME_DURATION</h2><h3 id="语法-1" tabindex="-1"><a class="header-anchor" href="#语法-1" aria-hidden="true">#</a> 语法</h3><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>    time_duration<span class="token punctuation">(</span>Path<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="使用示例-1" tabindex="-1"><a class="header-anchor" href="#使用示例-1" aria-hidden="true">#</a> 使用示例</h3><h4 id="准备数据" tabindex="-1"><a class="header-anchor" href="#准备数据" aria-hidden="true">#</a> 准备数据</h4><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+----------+-------------+
|      Time|root.db.d1.s1|
+----------+-------------+
|         1|           70|
|         3|           10|
|         4|          303|
|         6|          110|
|         7|          302|
|         8|          110|
|         9|           60|
|        10|           70|
|1677570934|           30|
+----------+-------------+
</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 class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h4 id="写入语句" tabindex="-1"><a class="header-anchor" href="#写入语句" aria-hidden="true">#</a> 写入语句</h4><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token string">&quot;CREATE DATABASE root.db&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;CREATE TIMESERIES root.db.d1.s1 WITH DATATYPE=INT32, ENCODING=PLAIN tags(city=Beijing)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(1, 2, 10, true)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(2, null, 20, true)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(3, 10, 0, null)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(4, 303, 30, true)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(5, null, 20, true)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(6, 110, 20, true)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(7, 302, 20, true)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(8, 110, null, true)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(9, 60, 20, true)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(10,70, 20, null)&quot;</span><span class="token punctuation">,</span>
<span class="token string">&quot;INSERT INTO root.db.d1(timestamp,s1,s2,s3) values(1677570934, 30, 0, true)&quot;</span><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 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 class="line-number"></div></div></div><p>查询：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> time_duration<span class="token punctuation">(</span>s1<span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d1
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>输出</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+----------------------------+
|time_duration(root.db.d1.s1)|
+----------------------------+
|                  1677570933|
+----------------------------+
</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></div><blockquote><p>注：若数据点只有一个，则返回0，若数据点为null，则返回null。</p></blockquote><h2 id="count-time" tabindex="-1"><a class="header-anchor" href="#count-time" aria-hidden="true">#</a> COUNT_TIME</h2><h3 id="语法-2" tabindex="-1"><a class="header-anchor" href="#语法-2" aria-hidden="true">#</a> 语法</h3><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>    count_time<span class="token punctuation">(</span><span class="token operator">*</span><span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="使用示例-2" tabindex="-1"><a class="header-anchor" href="#使用示例-2" aria-hidden="true">#</a> 使用示例</h3><h4 id="准备数据-1" tabindex="-1"><a class="header-anchor" href="#准备数据-1" aria-hidden="true">#</a> 准备数据</h4><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+----------+-------------+-------------+-------------+-------------+
|      Time|root.db.d1.s1|root.db.d1.s2|root.db.d2.s1|root.db.d2.s2|
+----------+-------------+-------------+-------------+-------------+
|         0|            0|         null|         null|            0|
|         1|         null|            1|            1|         null|
|         2|         null|            2|            2|         null|
|         4|            4|         null|         null|            4|
|         5|            5|            5|            5|            5|
|         7|         null|            7|            7|         null|
|         8|            8|            8|            8|            8|
|         9|         null|            9|         null|         null|
+----------+-------------+-------------+-------------+-------------+
</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 class="line-number"></div><div class="line-number"></div></div></div><h4 id="写入语句-1" tabindex="-1"><a class="header-anchor" href="#写入语句-1" aria-hidden="true">#</a> 写入语句</h4><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> <span class="token keyword">DATABASE</span> root<span class="token punctuation">.</span>db<span class="token punctuation">;</span>
<span class="token keyword">CREATE</span> TIMESERIES root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">WITH</span> DATATYPE<span class="token operator">=</span>INT32<span class="token punctuation">,</span> ENCODING<span class="token operator">=</span>PLAIN<span class="token punctuation">;</span>
<span class="token keyword">CREATE</span> TIMESERIES root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s2 <span class="token keyword">WITH</span> DATATYPE<span class="token operator">=</span>INT32<span class="token punctuation">,</span> ENCODING<span class="token operator">=</span>PLAIN<span class="token punctuation">;</span>
<span class="token keyword">CREATE</span> TIMESERIES root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d2<span class="token punctuation">.</span>s1 <span class="token keyword">WITH</span> DATATYPE<span class="token operator">=</span>INT32<span class="token punctuation">,</span> ENCODING<span class="token operator">=</span>PLAIN<span class="token punctuation">;</span>
<span class="token keyword">CREATE</span> TIMESERIES root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d2<span class="token punctuation">.</span>s2 <span class="token keyword">WITH</span> DATATYPE<span class="token operator">=</span>INT32<span class="token punctuation">,</span> ENCODING<span class="token operator">=</span>PLAIN<span class="token punctuation">;</span>
<span class="token keyword">INSERT</span> <span class="token keyword">INTO</span> root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d1<span class="token punctuation">(</span><span class="token keyword">time</span><span class="token punctuation">,</span> s1<span class="token punctuation">)</span> <span class="token keyword">VALUES</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">4</span><span class="token punctuation">,</span><span class="token number">4</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">5</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 punctuation">(</span><span class="token number">8</span><span class="token punctuation">,</span><span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">INSERT</span> <span class="token keyword">INTO</span> root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d1<span class="token punctuation">(</span><span class="token keyword">time</span><span class="token punctuation">,</span> s2<span class="token punctuation">)</span> <span class="token keyword">VALUES</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">5</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 punctuation">(</span><span class="token number">7</span><span class="token punctuation">,</span><span class="token number">7</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">8</span><span class="token punctuation">,</span><span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">9</span><span class="token punctuation">,</span><span class="token number">9</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">INSERT</span> <span class="token keyword">INTO</span> root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d2<span class="token punctuation">(</span><span class="token keyword">time</span><span class="token punctuation">,</span> s1<span class="token punctuation">)</span> <span class="token keyword">VALUES</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">5</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 punctuation">(</span><span class="token number">7</span><span class="token punctuation">,</span><span class="token number">7</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">8</span><span class="token punctuation">,</span><span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">INSERT</span> <span class="token keyword">INTO</span> root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d2<span class="token punctuation">(</span><span class="token keyword">time</span><span class="token punctuation">,</span> s2<span class="token punctuation">)</span> <span class="token keyword">VALUES</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">4</span><span class="token punctuation">,</span><span class="token number">4</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">5</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 punctuation">(</span><span class="token number">8</span><span class="token punctuation">,</span><span class="token number">8</span><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 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>查询示例1：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> count_time<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>db<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>输出</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-------------+
|count_time(*)|
+-------------+
|            8|
+-------------+
</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></div><p>查询示例2：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> count_time<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>db<span class="token punctuation">.</span>d1<span class="token punctuation">,</span> root<span class="token punctuation">.</span>db<span class="token punctuation">.</span>d2
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>输出</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-------------+
|count_time(*)|
+-------------+
|            8|
+-------------+
</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></div><p>查询示例3：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> count_time<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>db<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</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">0</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>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>输出</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-------------+
|                         Time|count_time(*)|
+-----------------------------+-------------+
|1970-01-01T08:00:00.000+08:00|            2|            
|1970-01-01T08:00:00.002+08:00|            1|            
|1970-01-01T08:00:00.004+08:00|            2|            
|1970-01-01T08:00:00.006+08:00|            1|            
|1970-01-01T08:00:00.008+08:00|            2|            
+-----------------------------+-------------+
</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></div><p>查询示例4：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">select</span> count_time<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>db<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</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">0</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> 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>输出</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+----------+-------------+
|                         Time|    Device|count_time(*)|
+-----------------------------+----------+-------------+
|1970-01-01T08:00:00.000+08:00|root.db.d1|            2|
|1970-01-01T08:00:00.002+08:00|root.db.d1|            1|
|1970-01-01T08:00:00.004+08:00|root.db.d1|            2|
|1970-01-01T08:00:00.006+08:00|root.db.d1|            1|
|1970-01-01T08:00:00.008+08:00|root.db.d1|            2|
|1970-01-01T08:00:00.000+08:00|root.db.d2|            2|
|1970-01-01T08:00:00.002+08:00|root.db.d2|            1|
|1970-01-01T08:00:00.004+08:00|root.db.d2|            2|
|1970-01-01T08:00:00.006+08:00|root.db.d2|            1|
|1970-01-01T08:00:00.008+08:00|root.db.d2|            1|
+-----------------------------+----------+-------------+

</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 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><blockquote><p>注：</p><ol><li>count_time里的表达式只能为*。</li><li>count_time不能和其他的聚合函数一起使用。</li><li>having语句里不支持使用count_time, 使用count_time聚合函数时不支持使用having语句。</li><li>count_time不支持与group by level, group by tag一起使用。</li></ol></blockquote>`,62);function i(l,c){return s(),a("div",null,[e(`

    Licensed to the Apache Software Foundation (ASF) under one
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    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
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        http://www.apache.org/licenses/LICENSE-2.0
    
    Unless required by applicable law or agreed to in writing,
    software distributed under the License is distributed on an
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    KIND, either express or implied.  See the License for the
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`),o])}const u=n(p,[["render",i],["__file","Aggregation.html.vue"]]);export{u as default};