| import{_ as e,o as n,c as s,a,f as l}from"./app-LsTKUu1f.js";const i={},o=l(`<h1 id="结果集排序" tabindex="-1"><a class="header-anchor" href="#结果集排序" aria-hidden="true">#</a> 结果集排序</h1><h2 id="时间对齐模式下的排序" tabindex="-1"><a class="header-anchor" href="#时间对齐模式下的排序" aria-hidden="true">#</a> 时间对齐模式下的排序</h2><p>IoTDB的查询结果集默认按照时间对齐，可以使用<code>ORDER BY TIME</code>的子句指定时间戳的排列顺序。示例代码如下：</p><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> <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">time</span> <span class="token keyword">desc</span><span class="token punctuation">;</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>执行结果：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+--------------------------+------------------------+-----------------------------+------------------------+ |
| | Time|root.ln.wf02.wt02.hardware|root.ln.wf02.wt02.status|root.ln.wf01.wt01.temperature|root.ln.wf01.wt01.status| |
| +-----------------------------+--------------------------+------------------------+-----------------------------+------------------------+ |
| |2017-11-01T00:01:00.000+08:00| v2| true| 24.36| true| |
| |2017-11-01T00:00:00.000+08:00| v2| true| 25.96| true| |
| |1970-01-01T08:00:00.002+08:00| v2| false| null| null| |
| |1970-01-01T08:00:00.001+08:00| v1| true| 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><h2 id="设备对齐模式下的排序" tabindex="-1"><a class="header-anchor" href="#设备对齐模式下的排序" aria-hidden="true">#</a> 设备对齐模式下的排序</h2><p>当使用<code>ALIGN BY DEVICE</code>查询对齐模式下的结果集时，可以使用<code>ORDER BY</code>子句对返回的结果集顺序进行规定。</p><p>在设备对齐模式下支持4种排序模式的子句,其中包括两种排序键，<code>DEVICE</code>和<code>TIME</code>，靠前的排序键为主排序键，每种排序键都支持<code>ASC</code>和<code>DESC</code>两种排列顺序。</p><ol><li><p><code>ORDER BY DEVICE</code>: 按照设备名的字典序进行排序，排序方式为字典序排序，在这种情况下，相同名的设备会以组的形式进行展示。</p></li><li><p><code>ORDER BY TIME</code>: 按照时间戳进行排序，此时不同的设备对应的数据点会按照时间戳的优先级被打乱排序。</p></li><li><p><code>ORDER BY DEVICE,TIME</code>: 按照设备名的字典序进行排序，设备名相同的数据点会通过时间戳进行排序。</p></li><li><p><code>ORDER BY TIME,DEVICE</code>: 按照时间戳进行排序，时间戳相同的数据点会通过设备名的字典序进行排序。</p></li></ol><blockquote><p>为了保证结果的可观性，当不使用<code>ORDER BY</code>子句，仅使用<code>ALIGN BY DEVICE</code>时，会为设备视图提供默认的排序方式。其中默认的排序视图为<code>ORDER BY DEVCE,TIME</code>，默认的排序顺序为<code>ASC</code>，<br> 即结果集默认先按照设备名升序排列，在相同设备名内再按照时间戳升序排序。</p></blockquote><p>当主排序键为<code>DEVICE</code>时，结果集的格式与默认情况类似：先按照设备名对结果进行排列，在相同的设备名下内按照时间戳进行排序。示例代码如下：</p><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> <span class="token keyword">order</span> <span class="token keyword">by</span> device <span class="token keyword">desc</span><span class="token punctuation">,</span><span class="token keyword">time</span> <span class="token keyword">asc</span> align <span class="token keyword">by</span> device<span class="token punctuation">;</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>执行结果：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------+--------+------+-----------+ |
| | Time| Device|hardware|status|temperature| |
| +-----------------------------+-----------------+--------+------+-----------+ |
| |1970-01-01T08:00:00.001+08:00|root.ln.wf02.wt02| v1| true| null| |
| |1970-01-01T08:00:00.002+08:00|root.ln.wf02.wt02| v2| false| null| |
| |2017-11-01T00:00:00.000+08:00|root.ln.wf02.wt02| v2| true| null| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf02.wt02| v2| true| null| |
| |2017-11-01T00:00:00.000+08:00|root.ln.wf01.wt01| null| true| 25.96| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf01.wt01| null| true| 24.36| |
| +-----------------------------+-----------------+--------+------+-----------+ |
| </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>主排序键为<code>Time</code>时，结果集会先按照时间戳进行排序，在时间戳相等时按照设备名排序。<br> 示例代码如下：</p><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> <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">time</span> <span class="token keyword">asc</span><span class="token punctuation">,</span>device <span class="token keyword">desc</span> align <span class="token keyword">by</span> device<span class="token punctuation">;</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>执行结果：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------+--------+------+-----------+ |
| | Time| Device|hardware|status|temperature| |
| +-----------------------------+-----------------+--------+------+-----------+ |
| |1970-01-01T08:00:00.001+08:00|root.ln.wf02.wt02| v1| true| null| |
| |1970-01-01T08:00:00.002+08:00|root.ln.wf02.wt02| v2| false| null| |
| |2017-11-01T00:00:00.000+08:00|root.ln.wf02.wt02| v2| true| null| |
| |2017-11-01T00:00:00.000+08:00|root.ln.wf01.wt01| null| true| 25.96| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf02.wt02| v2| true| null| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf01.wt01| null| true| 24.36| |
| +-----------------------------+-----------------+--------+------+-----------+ |
| </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>当没有显式指定时，主排序键默认为<code>Device</code>，排序顺序默认为<code>ASC</code>，示例代码如下：</p><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> align <span class="token keyword">by</span> device<span class="token punctuation">;</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>结果如图所示，可以看出，<code>ORDER BY DEVICE ASC,TIME ASC</code>就是默认情况下的排序方式，由于<code>ASC</code>是默认排序顺序，此处可以省略。</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------+--------+------+-----------+ |
| | Time| Device|hardware|status|temperature| |
| +-----------------------------+-----------------+--------+------+-----------+ |
| |2017-11-01T00:00:00.000+08:00|root.ln.wf01.wt01| null| true| 25.96| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf01.wt01| null| true| 24.36| |
| |1970-01-01T08:00:00.001+08:00|root.ln.wf02.wt02| v1| true| null| |
| |1970-01-01T08:00:00.002+08:00|root.ln.wf02.wt02| v2| false| null| |
| |2017-11-01T00:00:00.000+08:00|root.ln.wf02.wt02| v2| true| null| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf02.wt02| v2| true| 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></div><p>同样，可以在聚合查询中使用<code>ALIGN BY DEVICE</code>和<code>ORDER BY</code>子句，对聚合后的结果进行排序，示例代码如下所示：</p><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">count</span><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>ln<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">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">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 punctuation">,</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">03</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 punctuation">]</span><span class="token punctuation">,</span><span class="token number">1</span>m<span class="token punctuation">)</span> <span class="token keyword">order</span> <span class="token keyword">by</span> device <span class="token keyword">asc</span><span class="token punctuation">,</span><span class="token keyword">time</span> <span class="token keyword">asc</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>执行结果：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------+---------------+-------------+------------------+ |
| | Time| Device|count(hardware)|count(status)|count(temperature)| |
| +-----------------------------+-----------------+---------------+-------------+------------------+ |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf01.wt01| null| 1| 1| |
| |2017-11-01T00:02:00.000+08:00|root.ln.wf01.wt01| null| 0| 0| |
| |2017-11-01T00:03:00.000+08:00|root.ln.wf01.wt01| null| 0| 0| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf02.wt02| 1| 1| null| |
| |2017-11-01T00:02:00.000+08:00|root.ln.wf02.wt02| 0| 0| null| |
| |2017-11-01T00:03:00.000+08:00|root.ln.wf02.wt02| 0| 0| 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></div><h2 id="任意表达式排序" tabindex="-1"><a class="header-anchor" href="#任意表达式排序" aria-hidden="true">#</a> 任意表达式排序</h2><p>除了IoTDB中规定的Time，Device关键字外，还可以通过<code>ORDER BY</code>子句对指定时间序列中任意列的表达式进行排序。</p><p>排序在通过<code>ASC</code>,<code>DESC</code>指定排序顺序的同时，可以通过<code>NULLS</code>语法来指定NULL值在排序中的优先级，<code>NULLS FIRST</code>默认NULL值在结果集的最上方，<code>NULLS LAST</code>则保证NULL值在结果集的最后。如果没有在子句中指定，则默认顺序为<code>ASC</code>，<code>NULLS LAST</code>。</p><p>对于如下的数据，将给出几个任意表达式的查询示例供参考：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-------------+-------+-------+--------+-------+ |
| | Time| Device| base| score| bonus| total| |
| +-----------------------------+-------------+-------+-------+--------+-------+ |
| |1970-01-01T08:00:00.000+08:00| root.one| 12| 50.0| 45.0| 107.0| |
| |1970-01-02T08:00:00.000+08:00| root.one| 10| 50.0| 45.0| 105.0| |
| |1970-01-03T08:00:00.000+08:00| root.one| 8| 50.0| 45.0| 103.0| |
| |1970-01-01T08:00:00.010+08:00| root.two| 9| 50.0| 15.0| 74.0| |
| |1970-01-01T08:00:00.020+08:00| root.two| 8| 10.0| 15.0| 33.0| |
| |1970-01-01T08:00:00.010+08:00| root.three| 9| null| 24.0| 33.0| |
| |1970-01-01T08:00:00.020+08:00| root.three| 8| null| 22.5| 30.5| |
| |1970-01-01T08:00:00.030+08:00| root.three| 7| null| 23.5| 30.5| |
| |1970-01-01T08:00:00.010+08:00| root.four| 9| 32.0| 45.0| 86.0| |
| |1970-01-01T08:00:00.020+08:00| root.four| 8| 32.0| 45.0| 85.0| |
| |1970-01-01T08:00:00.030+08:00| root.five| 7| 53.0| 44.0| 104.0| |
| |1970-01-01T08:00:00.040+08:00| root.five| 6| 54.0| 42.0| 102.0| |
| +-----------------------------+-------------+-------+-------+--------+-------+ |
| </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 class="line-number"></div><div class="line-number"></div></div></div><p>当需要根据基础分数score对结果进行排序时，可以直接使用</p><div class="language-Sql line-numbers-mode" data-ext="Sql"><pre class="language-Sql"><code>select score from root.** order by score desc align by device |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>会得到如下结果</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+---------+-----+ |
| | Time| Device|score| |
| +-----------------------------+---------+-----+ |
| |1970-01-01T08:00:00.040+08:00|root.five| 54.0| |
| |1970-01-01T08:00:00.030+08:00|root.five| 53.0| |
| |1970-01-01T08:00:00.000+08:00| root.one| 50.0| |
| |1970-01-02T08:00:00.000+08:00| root.one| 50.0| |
| |1970-01-03T08:00:00.000+08:00| root.one| 50.0| |
| |1970-01-01T08:00:00.000+08:00| root.two| 50.0| |
| |1970-01-01T08:00:00.010+08:00| root.two| 50.0| |
| |1970-01-01T08:00:00.010+08:00|root.four| 32.0| |
| |1970-01-01T08:00:00.020+08:00|root.four| 32.0| |
| |1970-01-01T08:00:00.020+08:00| root.two| 10.0| |
| +-----------------------------+---------+-----+ |
| </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><p>当想要根据总分对结果进行排序，可以在order by子句中使用表达式进行计算</p><div class="language-Sql line-numbers-mode" data-ext="Sql"><pre class="language-Sql"><code>select score,total from root.one order by base+score+bonus desc |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>该sql等价于</p><div class="language-Sql line-numbers-mode" data-ext="Sql"><pre class="language-Sql"><code>select score,total from root.one order by total desc |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>得到如下结果</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+--------------+--------------+ |
| | Time|root.one.score|root.one.total| |
| +-----------------------------+--------------+--------------+ |
| |1970-01-01T08:00:00.000+08:00| 50.0| 107.0| |
| |1970-01-02T08:00:00.000+08:00| 50.0| 105.0| |
| |1970-01-03T08:00:00.000+08:00| 50.0| 103.0| |
| +-----------------------------+--------------+--------------+ |
| </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></div><p>而如果要对总分进行排序，且分数相同时依次根据score, base, bonus和提交时间进行排序时，可以通过多个表达式来指定多层排序</p><div class="language-Sql line-numbers-mode" data-ext="Sql"><pre class="language-Sql"><code>select base, score, bonus, total from root.** order by total desc NULLS Last, |
| score desc NULLS Last, |
| bonus desc NULLS Last, |
| time desc align by device |
| </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></div><p>得到如下结果</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+----------+----+-----+-----+-----+ |
| | Time| Device|base|score|bonus|total| |
| +-----------------------------+----------+----+-----+-----+-----+ |
| |1970-01-01T08:00:00.000+08:00| root.one| 12| 50.0| 45.0|107.0| |
| |1970-01-02T08:00:00.000+08:00| root.one| 10| 50.0| 45.0|105.0| |
| |1970-01-01T08:00:00.030+08:00| root.five| 7| 53.0| 44.0|104.0| |
| |1970-01-03T08:00:00.000+08:00| root.one| 8| 50.0| 45.0|103.0| |
| |1970-01-01T08:00:00.040+08:00| root.five| 6| 54.0| 42.0|102.0| |
| |1970-01-01T08:00:00.010+08:00| root.four| 9| 32.0| 45.0| 86.0| |
| |1970-01-01T08:00:00.020+08:00| root.four| 8| 32.0| 45.0| 85.0| |
| |1970-01-01T08:00:00.010+08:00| root.two| 9| 50.0| 15.0| 74.0| |
| |1970-01-01T08:00:00.000+08:00| root.two| 9| 50.0| 15.0| 74.0| |
| |1970-01-01T08:00:00.020+08:00| root.two| 8| 10.0| 15.0| 33.0| |
| |1970-01-01T08:00:00.010+08:00|root.three| 9| null| 24.0| 33.0| |
| |1970-01-01T08:00:00.030+08:00|root.three| 7| null| 23.5| 30.5| |
| |1970-01-01T08:00:00.020+08:00|root.three| 8| null| 22.5| 30.5| |
| +-----------------------------+----------+----+-----+-----+-----+ |
| </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 class="line-number"></div><div class="line-number"></div></div></div><p>在order by中同样可以使用聚合查询表达式</p><div class="language-Sql line-numbers-mode" data-ext="Sql"><pre class="language-Sql"><code>select min_value(total) from root.** order by min_value(total) asc align by device |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>得到如下结果</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+----------+----------------+ |
| | Device|min_value(total)| |
| +----------+----------------+ |
| |root.three| 30.5| |
| | root.two| 33.0| |
| | root.four| 85.0| |
| | root.five| 102.0| |
| | root.one| 103.0| |
| +----------+----------------+ |
| </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></div><p>当在查询中指定多列，未被排序的列会随着行和排序列一起改变顺序，当排序列相同时行的顺序和具体实现有关（没有固定顺序）</p><div class="language-Sql line-numbers-mode" data-ext="Sql"><pre class="language-Sql"><code>select min_value(total),max_value(base) from root.** order by max_value(total) desc align by device |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>得到结果如下<br> ·</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+----------+----------------+---------------+ |
| | Device|min_value(total)|max_value(base)| |
| +----------+----------------+---------------+ |
| | root.one| 103.0| 12| |
| | root.five| 102.0| 7| |
| | root.four| 85.0| 9| |
| | root.two| 33.0| 9| |
| |root.three| 30.5| 9| |
| +----------+----------------+---------------+ |
| </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>Order by device, time可以和order by expression共同使用</p><div class="language-Sql line-numbers-mode" data-ext="Sql"><pre class="language-Sql"><code>select score from root.** order by device asc, score desc, time asc align by device |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>会得到如下结果</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+---------+-----+ |
| | Time| Device|score| |
| +-----------------------------+---------+-----+ |
| |1970-01-01T08:00:00.040+08:00|root.five| 54.0| |
| |1970-01-01T08:00:00.030+08:00|root.five| 53.0| |
| |1970-01-01T08:00:00.010+08:00|root.four| 32.0| |
| |1970-01-01T08:00:00.020+08:00|root.four| 32.0| |
| |1970-01-01T08:00:00.000+08:00| root.one| 50.0| |
| |1970-01-02T08:00:00.000+08:00| root.one| 50.0| |
| |1970-01-03T08:00:00.000+08:00| root.one| 50.0| |
| |1970-01-01T08:00:00.000+08:00| root.two| 50.0| |
| |1970-01-01T08:00:00.010+08:00| root.two| 50.0| |
| |1970-01-01T08:00:00.020+08:00| root.two| 10.0| |
| +-----------------------------+---------+-----+ |
| </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>`,58);function d(r,t){return n(),s("div",null,[a(` |
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| `),o])}const u=e(i,[["render",d],["__file","Order-By.html.vue"]]);export{u as default}; |
