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| --><h2 id="连续查询-continuous-query-cq" tabindex="-1"><a class="header-anchor" href="#连续查询-continuous-query-cq" aria-hidden="true">#</a> 连续查询（Continuous Query, CQ）</h2><p>我们可以通过 SQL 语句注册、或卸载一个 CQ 实例，以及查询到所有已经注册的 CQ 配置信息。</p><p>注意，目前连续查询尚未对分布式场景进行适配。敬请期待分布式版本。</p><h3 id="sql-语句" tabindex="-1"><a class="header-anchor" href="#sql-语句" aria-hidden="true">#</a> SQL 语句</h3><h4 id="创建-cq" tabindex="-1"><a class="header-anchor" href="#创建-cq" aria-hidden="true">#</a> 创建 CQ</h4><h5 id="语法" tabindex="-1"><a class="header-anchor" href="#语法" aria-hidden="true">#</a> 语法</h5><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>CONTINUOUS QUERY <span class="token operator">|</span> CQ<span class="token punctuation">)</span> <span class="token operator"><</span>cq_id<span class="token operator">></span> |
| <span class="token punctuation">[</span>RESAMPLE EVERY <span class="token operator"><</span>every_interval<span class="token operator">></span> <span class="token keyword">FOR</span> <span class="token operator"><</span>for_interval<span class="token operator">></span> BOUNDARY <span class="token operator"><</span>execution_boundary_time<span class="token operator">></span><span class="token punctuation">]</span> |
| <span class="token keyword">BEGIN</span> |
| <span class="token keyword">SELECT</span> <span class="token operator"><</span><span class="token keyword">function</span><span class="token operator">></span><span class="token punctuation">(</span><span class="token operator"><</span>path_suffix<span class="token operator">></span><span class="token punctuation">)</span> <span class="token keyword">INTO</span> <span class="token operator"><</span>full_path<span class="token operator">></span> <span class="token operator">|</span> <span class="token operator"><</span>node_name<span class="token operator">></span> |
| <span class="token keyword">FROM</span> <span class="token operator"><</span>path_prefix<span class="token operator">></span> |
| <span class="token keyword">GROUP</span> <span class="token keyword">BY</span> <span class="token keyword">time</span><span class="token punctuation">(</span><span class="token operator"><</span>group_by_interval<span class="token operator">></span><span class="token punctuation">)</span> <span class="token punctuation">[</span><span class="token punctuation">,</span> <span class="token keyword">level</span> <span class="token operator">=</span> <span class="token operator"><</span><span class="token keyword">level</span><span class="token operator">></span><span class="token punctuation">]</span> |
| <span class="token keyword">END</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></div><p>其中：</p><ul><li><p><code><cq_id></code> 指定 CQ 全局唯一的 id。</p></li><li><p><code><every_interval></code> 指定查询执行时间间隔，支持 ns、us、ms、s、m、h、d、w 等单位，其值不应小于用户所配置的 <code>continuous_query_min_every_interval</code> 值。可选择指定。</p></li><li><p><code><for_interval></code> 指定每次查询的窗口大小，即查询时间范围为<code>[now() - <for_interval>, now())</code>，其中 <code>now()</code> 指查询时的时间戳。支持 ns、us、ms、s、m、h、d、w 等单位。可选择指定。</p></li><li><p><code><execution_boundary_time></code> 是一个日期参数，表示<strong>第一个窗口的起始时间</strong>。</p><ul><li><code><execution_boundary_time></code> 可早于、等于、晚于<strong>当前时间</strong>。</li><li>该参数可选择指定，不指定的情况下等价于输入 <code>BOUNDARY now()</code>。</li><li><strong>第一个窗口的结束时间</strong>为 <code><execution_boundary_time> + <for_interval></code>。</li><li>第 <code> i (1 <= i)</code> 个窗口的<strong>开始时间</strong> <code><execution_boundary_time> + <for_interval> + （i - 1） * <every_interval></code>。</li><li>第 <code> i (1 <= i)</code> 个窗口的<strong>结束时间</strong> <code><execution_boundary_time> + <for_interval> + i * <every_interval></code>。</li><li>如果<strong>当前时间</strong>小于等于<strong>第一个窗口的结束时间</strong> ，那么连续查询的第一个执行时刻为<strong>第一个窗口的结束时间</strong>。</li><li>如果<strong>当前时间</strong>大于<strong>第一个窗口的结束时间</strong>，那么连续查询的第一个执行时刻为<strong>第一个</strong>大于等于<strong>当前时间</strong>的<strong>窗口结束时间</strong>。</li><li>每一个执行时刻执行的<strong>查询时间范围</strong>为<code>[now() - <for_interval>, now())</code>。</li></ul></li><li><p><code><function></code> 指定聚合函数，目前支持 <code>count</code>, <code>sum</code>, <code>avg</code>, <code>last_value</code>, <code>first_value</code>, <code>min_time</code>, <code>max_time</code>, <code>min_value</code>, <code>max_value</code> 等。</p></li><li><p><code><path_prefix></code> 与 <code><path_suffix></code> 拼接成完整的查询原时间序列。</p></li><li><p><code><full_path></code> 或 <code><node_name></code> 指定将查询出的数据写入的结果序列路径。</p></li><li><p><code><group_by_interval></code> 指定时间分组长度，支持 ns、us、ms、s、m、h、d、w、mo、y 等单位。</p></li><li><p><code><level></code>指按照序列第 <code><level></code> 层分组，将第 <code><level></code> 层同名的所有序列聚合。Group By Level 语句的具体语义及 <code><level></code> 的定义见 <a href="/zh/UserGuide/V0.13.x/Query-Data/Aggregate-Query.html#%E8%81%9A%E5%90%88%E6%9F%A5%E8%AF%A2" class="">路径层级分组聚合</a>。</p></li></ul><p>注：</p><ul><li><code><for_interval></code>, <code><every_interval></code> 可选择指定。如果用户没有指定其中的某一项，则未指定项的值按照<code><group_by_interval></code> 处理。 <ul><li><code><every_interval></code>，<code><for_interval></code>，<code><group_by_interval></code> 的值均应大于 0。</li><li><code><group_by_interval></code> 的值应小于<code><for_interval></code>的值，否则系统会按照等于<code><for_interval></code>的值处理。</li><li>用户应当结合实际需求指定合适的 <code><for_interval></code> 与 <code><every_interval></code>。 <ul><li>若 <code><for_interval></code> 大于 <code><every_interval></code>，每次的查询窗口会有部分数据重叠，从查询性能角度这种配置不被建议。</li><li>若 <code><for_interval></code> 小于 <code><every_interval></code>，每次的查询窗口之间可能会有未覆盖到的数据。</li></ul></li></ul></li><li>对于结果序列路径 <ul><li>用户可以选择指定<code><full_path></code>，即以 <code>root</code> 开头的完整的时间序列路径，用户可以在路径中使用 <code>${x}</code> 变量来表示原始时间序列中 <code>level = x</code> 的节点名称，<code>x</code>应当大于等于 1 且小于等于 <code><level></code> 值 （若未指定 <code>level</code>，则应小于等于 <code><path_prefix></code> 长度）。</li><li>用户也可以仅指定<code><node_name></code>，即生成时间序列路径的最后一个结点名。 <ul><li>若用户指定 <code><level> = l</code>，则系统生成的结果时间序列路径为 <code>root.${1}. ... .${l}.<node_name></code></li><li>若用户未指定 <code><level></code>，令原始时间序列最大层数为 <code>L</code>， 则系统生成的结果时间序列路径为 <code>root.${1}. ... .${L - 1}.<node_name></code>。</li></ul></li></ul></li></ul><h5 id="示例" tabindex="-1"><a class="header-anchor" href="#示例" aria-hidden="true">#</a> 示例</h5><h6 id="原始时间序列" tabindex="-1"><a class="header-anchor" href="#原始时间序列" aria-hidden="true">#</a> 原始时间序列</h6><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| |
| +-----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| |root.ln.wf02.wt02.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf02.wt01.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.wt02.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.wt01.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|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></div><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+ |
| | Time|root.ln.wf02.wt02.temperature|root.ln.wf02.wt01.temperature|root.ln.wf01.wt02.temperature|root.ln.wf01.wt01.temperature| |
| +-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+ |
| |2021-05-11T22:18:14.598+08:00| 121.0| 72.0| 183.0| 115.0| |
| |2021-05-11T22:18:19.941+08:00| 0.0| 68.0| 68.0| 103.0| |
| |2021-05-11T22:18:24.949+08:00| 122.0| 45.0| 11.0| 14.0| |
| |2021-05-11T22:18:29.967+08:00| 47.0| 14.0| 59.0| 181.0| |
| |2021-05-11T22:18:34.979+08:00| 182.0| 113.0| 29.0| 180.0| |
| |2021-05-11T22:18:39.990+08:00| 42.0| 11.0| 52.0| 19.0| |
| |2021-05-11T22:18:44.995+08:00| 78.0| 38.0| 123.0| 52.0| |
| |2021-05-11T22:18:49.999+08:00| 137.0| 172.0| 135.0| 193.0| |
| |2021-05-11T22:18:55.003+08:00| 16.0| 124.0| 183.0| 18.0| |
| +-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+ |
| </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></div><h6 id="结果序列配置举例说明" tabindex="-1"><a class="header-anchor" href="#结果序列配置举例说明" aria-hidden="true">#</a> 结果序列配置举例说明</h6><p>对于以上原始时间序列，若用户指定查询聚合层级为 <code>2</code>，聚合函数为 <code>avg</code>， 用户可以在 <code>INTO</code> 语句中仅指定生成序列的最后一个结点名，若用户将其指定为 <code>temperature_avg</code>，则系统生成的完整路径为 <code>root.${1}.${2}.temperature_avg</code>。 用户也可以在 <code>INTO</code> 语句中指定完整写入路径，用户可将其指定为 <code>root.${1}.${2}.temperature_avg</code>、<code>root.ln_cq.${2}.temperature_avg</code>、<code>root.${1}_cq.${2}.temperature_avg</code>、<code>root.${1}.${2}_cq.temperature_avg</code>等， 也可以按需要指定为 <code>root.${2}.${1}.temperature_avg</code> 等其它形式。 需要注意的是，<code>${x}</code> 中的 <code>x</code> 应当大于等于 <code>1</code> 且小于等于 <code><level></code> 值 （若未指定 <code><level></code>，则应小于等于 <code><path_prefix></code> 层级）。在上例中，<code>x</code> 应当小于等于 <code>2</code>。</p><h6 id="创建-cq1" tabindex="-1"><a class="header-anchor" href="#创建-cq1" aria-hidden="true">#</a> 创建 <code>cq1</code></h6><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> CONTINUOUS QUERY cq1 |
| <span class="token keyword">BEGIN</span> |
| <span class="token keyword">SELECT</span> max_value<span class="token punctuation">(</span>temperature<span class="token punctuation">)</span> |
| <span class="token keyword">INTO</span> temperature_max |
| <span class="token keyword">FROM</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span><span class="token operator">*</span><span class="token punctuation">.</span><span class="token operator">*</span> |
| <span class="token keyword">GROUP</span> <span class="token keyword">BY</span> <span class="token keyword">time</span><span class="token punctuation">(</span><span class="token number">10</span>s<span class="token punctuation">)</span> |
| <span class="token keyword">END</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>每隔 10s 查询 <code>root.ln.*.*.temperature</code> 在前 10s 内的最大值（结果以 10s 为一组）， 将结果写入到 <code>root.${1}.${2}.${3}.temperature_max</code> 中， 结果将产生 4 条新序列：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+---------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| |
| +---------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| |root.ln.wf02.wt02.temperature_max| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf02.wt01.temperature_max| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.wt02.temperature_max| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.wt01.temperature_max| null| root.ln| FLOAT| GORILLA| SNAPPY|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></div><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |
| | Time|root.ln.wf02.wt02.temperature_max|root.ln.wf02.wt01.temperature_max|root.ln.wf01.wt02.temperature_max|root.ln.wf01.wt01.temperature_max| |
| +-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |
| |2021-05-11T22:18:16.964+08:00| 122.0| 68.0| 68.0| 103.0| |
| |2021-05-11T22:18:26.964+08:00| 182.0| 113.0| 59.0| 181.0| |
| |2021-05-11T22:18:36.964+08:00| 78.0| 38.0| 123.0| 52.0| |
| |2021-05-11T22:18:46.964+08:00| 137.0| 172.0| 183.0| 193.0| |
| +-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |
| </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></div><h6 id="创建-cq2" tabindex="-1"><a class="header-anchor" href="#创建-cq2" aria-hidden="true">#</a> 创建 <code>cq2</code></h6><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> CONTINUOUS QUERY cq2 |
| RESAMPLE EVERY <span class="token number">20</span>s <span class="token keyword">FOR</span> <span class="token number">20</span>s |
| <span class="token keyword">BEGIN</span> |
| <span class="token keyword">SELECT</span> <span class="token function">avg</span><span class="token punctuation">(</span>temperature<span class="token punctuation">)</span> |
| <span class="token keyword">INTO</span> temperature_avg |
| <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 punctuation">.</span><span class="token operator">*</span> |
| <span class="token keyword">GROUP</span> <span class="token keyword">BY</span> <span class="token keyword">time</span><span class="token punctuation">(</span><span class="token number">10</span>s<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">level</span><span class="token operator">=</span><span class="token number">2</span> |
| <span class="token keyword">END</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></div><p>每隔 20s 查询 <code>root.ln.*.*.temperature</code> 在前 20s 内的平均值（结果以 10s 为一组，按照第 2 层节点分组）， 将结果写入到 <code>root.${1}.${2}.temperature_avg</code> 中。 结果将产生如下两条新序列， 其中 <code>root.ln.wf02.temperature_avg</code> 由 <code>root.ln.wf02.wt02.temperature</code> 和 <code>root.ln.wf02.wt01.temperature</code> 聚合计算生成， <code>root.ln.wf01.temperature_avg</code> 由 <code>root.ln.wf01.wt02.temperature</code> 和 <code>root.ln.wf01.wt01.temperature</code> 聚合计算生成。</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| |
| +----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| |root.ln.wf02.temperature_avg| null| root.ln| DOUBLE| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.temperature_avg| null| root.ln| DOUBLE| GORILLA| SNAPPY|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></div><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+----------------------------+----------------------------+ |
| | Time|root.ln.wf02.temperature_avg|root.ln.wf01.temperature_avg| |
| +-----------------------------+----------------------------+----------------------------+ |
| |2021-05-11T22:18:16.969+08:00| 58.75| 49.0| |
| |2021-05-11T22:18:26.969+08:00| 89.0| 112.25| |
| |2021-05-11T22:18:36.969+08:00| 42.25| 61.5| |
| |2021-05-11T22:18:46.969+08:00| 112.25| 132.25| |
| +-----------------------------+----------------------------+----------------------------+ |
| </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></div><h6 id="创建-cq3" tabindex="-1"><a class="header-anchor" href="#创建-cq3" aria-hidden="true">#</a> 创建 <code>cq3</code></h6><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> CONTINUOUS QUERY cq3 |
| RESAMPLE EVERY <span class="token number">20</span>s <span class="token keyword">FOR</span> <span class="token number">20</span>s |
| <span class="token keyword">BEGIN</span> |
| <span class="token keyword">SELECT</span> <span class="token function">avg</span><span class="token punctuation">(</span>temperature<span class="token punctuation">)</span> |
| <span class="token keyword">INTO</span> root<span class="token punctuation">.</span>ln_cq<span class="token punctuation">.</span>${<span class="token number">2</span>}<span class="token punctuation">.</span>temperature_avg |
| <span class="token keyword">FROM</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span><span class="token operator">*</span><span class="token punctuation">.</span><span class="token operator">*</span> |
| <span class="token keyword">GROUP</span> <span class="token keyword">BY</span> <span class="token keyword">time</span><span class="token punctuation">(</span><span class="token number">10</span>s<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">level</span><span class="token operator">=</span><span class="token number">2</span> |
| <span class="token keyword">END</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>查询模式与 cq2 相同，在这个例子中，用户自行指定结果写入到 <code>root.ln_cq.${2}.temperature_avg</code> 中。 结果将产生如下两条新序列， 其中 <code>root.ln_cq.wf02.temperature_avg</code> 由 <code>root.ln.wf02.wt02.temperature</code> 和 <code>root.ln.wf02.wt01.temperature</code> 聚合计算生成， <code>root.ln_cq.wf01.temperature_avg</code> 由 <code>root.ln.wf01.wt02.temperature</code> 和 <code>root.ln.wf01.wt01.temperature</code> 聚合计算生成。</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| |
| +-------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| |root.ln_cq.wf02.temperature_avg| null| root.ln_cq| DOUBLE| GORILLA| SNAPPY|null| null| |
| |root.ln_cq.wf01.temperature_avg| null| root.ln_cq| DOUBLE| GORILLA| SNAPPY|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></div><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-------------------------------+-------------------------------+ |
| | Time|root.ln_cq.wf02.temperature_avg|root.ln_cq.wf01.temperature_avg| |
| +-----------------------------+-------------------------------+-------------------------------+ |
| |2021-05-11T22:18:16.971+08:00| 58.75| 49.0| |
| |2021-05-11T22:18:26.971+08:00| 89.0| 112.25| |
| |2021-05-11T22:18:36.971+08:00| 42.25| 61.5| |
| |2021-05-11T22:18:46.971+08:00| 112.25| 132.25| |
| +-----------------------------+-------------------------------+-------------------------------+ |
| </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></div><h6 id="创建-cq4" tabindex="-1"><a class="header-anchor" href="#创建-cq4" aria-hidden="true">#</a> 创建 <code>cq4</code></h6><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> CONTINUOUS QUERY cq4 |
| RESAMPLE EVERY <span class="token number">20</span>s <span class="token keyword">FOR</span> <span class="token number">20</span>s BOUNDARY <span class="token number">2022</span><span class="token operator">-</span><span class="token number">01</span><span class="token operator">-</span><span class="token number">14</span>T23:<span class="token number">00</span>:<span class="token number">00.000</span><span class="token operator">+</span><span class="token number">08</span>:<span class="token number">00</span> |
| <span class="token keyword">BEGIN</span> |
| <span class="token keyword">SELECT</span> <span class="token function">avg</span><span class="token punctuation">(</span>temperature<span class="token punctuation">)</span> |
| <span class="token keyword">INTO</span> root<span class="token punctuation">.</span>ln_cq<span class="token punctuation">.</span>${<span class="token number">2</span>}<span class="token punctuation">.</span>temperature_avg |
| <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 punctuation">.</span><span class="token operator">*</span> <span class="token keyword">GROUP</span> <span class="token keyword">BY</span> <span class="token keyword">time</span><span class="token punctuation">(</span><span class="token number">10</span>s<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">level</span><span class="token operator">=</span><span class="token number">2</span> |
| <span class="token keyword">END</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></div><p>这个例子与创建 cq3 几乎完全相同。不同的是，在这个例子中用户自行指定了 <code>BOUNDARY 2022-01-14T23:00:00.000+08:00 </code> 。</p><p>注意这个 CQ 的第一个执行时刻大于例子中的时间，因此 <code>2022-01-14T23:00:20.000+08:00</code> 为第一个执行时刻。递推地，<code>2022-01-14T23:00:40.000+08:00</code> 为第二个执行时刻，<code>2022-01-14T23:01:00.000+08:00</code> 为第三个执行时刻……</p><p>第一个执行时刻执行的 SQL 语句为 <code>select avg(temperature) from root.ln.*.* group by ([2022-01-14T23:00:00.000+08:00, 2022-01-14T23:00:20.000+08:00), 10s), level = 2</code>。</p><p>第二个执行时刻执行的 SQL 语句为 <code>select avg(temperature) from root.ln.*.* group by ([2022-01-14T23:00:20.000+08:00, 2022-01-14T23:00:40.000+08:00), 10s), level = 2</code>。</p><p>第三个执行时刻执行的 SQL 语句为 <code>select avg(temperature) from root.ln.*.* group by ([2022-01-14T23:00:40.000+08:00, 2022-01-14T23:01:00.000+08:00), 10s), level = 2</code>。</p><p>……</p><h4 id="展示-cq-信息" tabindex="-1"><a class="header-anchor" href="#展示-cq-信息" aria-hidden="true">#</a> 展示 CQ 信息</h4><h5 id="语法-1" tabindex="-1"><a class="header-anchor" href="#语法-1" aria-hidden="true">#</a> 语法</h5><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">SHOW</span> <span class="token punctuation">(</span>CONTINUOUS QUERIES <span class="token operator">|</span> CQS<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h5 id="结果示例" tabindex="-1"><a class="header-anchor" href="#结果示例" aria-hidden="true">#</a> 结果示例</h5><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-------+--------------+------------+-------------+----------------------------------------------------------------------------------------+-----------------------------------+ |
| |cq name|every interval|for interval| boundary| query sql| target path| |
| +-------+--------------+------------+-------------+----------------------------------------------------------------------------------------+-----------------------------------+ |
| | cq1| 10000| 10000|1642166102238| select max_value(temperature) from root.ln.*.* group by ([now() - 10s, now()), 10s)|root.${1}.${2}.${3}.temperature_max| |
| | cq3| 20000| 20000|1642166118339|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2| root.ln_cq.${2}.temperature_avg| |
| | cq2| 20000| 20000|1642166111493|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2| root.${1}.${2}.temperature_avg| |
| | cq4| 20000| 20000|1642172400000|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2| root.ln_cq.${2}.temperature_avg| |
| +-------+--------------+------------+-------------+----------------------------------------------------------------------------------------+-----------------------------------+ |
| </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></div><h4 id="删除-cq" tabindex="-1"><a class="header-anchor" href="#删除-cq" aria-hidden="true">#</a> 删除 CQ</h4><h5 id="语法-2" tabindex="-1"><a class="header-anchor" href="#语法-2" aria-hidden="true">#</a> 语法</h5><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">DROP</span> <span class="token punctuation">(</span>CONTINUOUS QUERY <span class="token operator">|</span> CQ<span class="token punctuation">)</span> <span class="token operator"><</span>cq_id<span class="token operator">></span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h5 id="示例-1" tabindex="-1"><a class="header-anchor" href="#示例-1" aria-hidden="true">#</a> 示例</h5><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">DROP</span> CONTINUOUS QUERY cq3 |
| </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">DROP</span> CQ cq3 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="系统参数配置" tabindex="-1"><a class="header-anchor" href="#系统参数配置" aria-hidden="true">#</a> 系统参数配置</h3><table><thead><tr><th style="text-align:left;">参数名</th><th>描述</th><th>数据类型</th><th>默认值</th></tr></thead><tbody><tr><td style="text-align:left;"><code>continuous_query_execution_thread</code></td><td>执行连续查询任务的线程池的线程数</td><td>int</td><td>max(1, CPU 核数 / 2)</td></tr><tr><td style="text-align:left;"><code>max_pending_continuous_query_tasks</code></td><td>队列中连续查询最大任务堆积数</td><td>int</td><td>64</td></tr><tr><td style="text-align:left;"><code>continuous_query_min_every_interval</code></td><td>连续查询执行时间间隔的最小值</td><td>duration</td><td>1s</td></tr></tbody></table></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/Process-Data/Continuous-Query.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/Process-Data/Select-Into.html" class="nav-link prev" aria-label="查询写回(SELECT INTO)"><div class="hint"><span class="arrow start"></span>上一页</div><div class="link"><!---->查询写回(SELECT INTO)</div></a><a href="/zh/UserGuide/V0.13.x/Process-Data/Triggers.html" class="nav-link next" aria-label="触发器"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">触发器<!----></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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