| import{_ as e,O as n,P as s,ah as a,aW as t}from"./framework-62ad666a.js";const i={},l=t(`<h1 id="query-result-alignment" tabindex="-1"><a class="header-anchor" href="#query-result-alignment" aria-hidden="true">#</a> Query Result Alignment</h1><p>In addition, IoTDB supports two other results set format: 'align by device' and 'disable align'.</p><h2 id="align-by-device" tabindex="-1"><a class="header-anchor" href="#align-by-device" aria-hidden="true">#</a> align by device</h2><p>The 'align by device' indicates that the deviceId is considered as a column. Therefore, there are totally limited columns in the dataset.</p><p>The SQL statement is:</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 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>The result shows below:</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------+-----------+------+--------+ |
| | Time| Device|temperature|status|hardware| |
| +-----------------------------+-----------------+-----------+------+--------+ |
| |2017-11-01T00:00:00.000+08:00|root.ln.wf01.wt01| 25.96| true| null| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf01.wt01| 24.36| true| null| |
| |1970-01-01T08:00:00.001+08:00|root.ln.wf02.wt02| null| true| v1| |
| |1970-01-01T08:00:00.002+08:00|root.ln.wf02.wt02| null| false| v2| |
| |2017-11-01T00:00:00.000+08:00|root.ln.wf02.wt02| null| true| v2| |
| |2017-11-01T00:01:00.000+08:00|root.ln.wf02.wt02| null| true| v2| |
| +-----------------------------+-----------------+-----------+------+--------+ |
| Total line number = 6 |
| It costs 0.012s |
| </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><h3 id="disable-align" tabindex="-1"><a class="header-anchor" href="#disable-align" aria-hidden="true">#</a> disable align</h3><p>The 'disable align' indicates that there are 2 columns for each time series in the result set. Disable Align Clause can only be used at the end of a query statement. Disable Align Clause cannot be used with Aggregation, Fill Statements, Group By or Group By Device Statements, but can with Limit Statements. The display principle of the result table is that only when the column (or row) has existing data will the column (or row) be shown, with nonexistent cells being empty.</p><p>The SQL statement is:</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">disable</span> align |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>The result shows below:</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+--------------------------+-----------------------------+------------------------+-----------------------------+-----------------------------+-----------------------------+------------------------+ |
| | Time|root.ln.wf02.wt02.hardware| Time|root.ln.wf02.wt02.status| Time|root.ln.wf01.wt01.temperature| Time|root.ln.wf01.wt01.status| |
| +-----------------------------+--------------------------+-----------------------------+------------------------+-----------------------------+-----------------------------+-----------------------------+------------------------+ |
| |1970-01-01T08:00:00.001+08:00| v1|1970-01-01T08:00:00.001+08:00| true|2017-11-01T00:00:00.000+08:00| 25.96|2017-11-01T00:00:00.000+08:00| true| |
| |1970-01-01T08:00:00.002+08:00| v2|1970-01-01T08:00:00.002+08:00| false|2017-11-01T00:01:00.000+08:00| 24.36|2017-11-01T00:01:00.000+08:00| true| |
| |2017-11-01T00:00:00.000+08:00| v2|2017-11-01T00:00:00.000+08:00| true| null| null| null| null| |
| |2017-11-01T00:01:00.000+08:00| v2|2017-11-01T00:01:00.000+08:00| true| null| null| null| null| |
| +-----------------------------+--------------------------+-----------------------------+------------------------+-----------------------------+-----------------------------+-----------------------------+------------------------+ |
| Total line number = 4 |
| It costs 0.018s |
| </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>`,14);function r(o,d){return n(),s("div",null,[a(` |
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| `),l])}const u=e(i,[["render",r],["__file","Result-Format.html.vue"]]);export{u as default}; |
