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class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#data-type-compatibility">Data Type Compatibility</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#timestamp">Timestamp</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#absolute-timestamp">Absolute timestamp</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#relative-timestamp">Relative timestamp</a></li><!----><!--]--></ul></li><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="data-type" tabindex="-1"><a class="header-anchor" href="#data-type"><span>Data Type</span></a></h1><h2 id="basic-data-type" tabindex="-1"><a class="header-anchor" href="#basic-data-type"><span>Basic Data Type</span></a></h2><p>IoTDB supports the following data types:</p><ul><li>BOOLEAN (Boolean)</li><li>INT32 (Integer)</li><li>INT64 (Long Integer)</li><li>FLOAT (Single Precision Floating Point)</li><li>DOUBLE (Double Precision Floating Point)</li><li>TEXT (String)</li></ul><h3 id="float-precision" tabindex="-1"><a class="header-anchor" href="#float-precision"><span>Float Precision</span></a></h3><p>The time series of <strong>FLOAT</strong> and <strong>DOUBLE</strong> type can specify (MAX_POINT_NUMBER, see <a class="route-link" href="/UserGuide/V1.1.x/Reference/SQL-Reference.html">this page</a> for more information on how to specify), which is the number of digits after the decimal point of the floating point number, if the encoding method is <a class="route-link" href="/UserGuide/V1.1.x/Data-Concept/Encoding.html">RLE</a> or <a class="route-link" href="/UserGuide/V1.1.x/Data-Concept/Encoding.html">TS_2DIFF</a>. If MAX_POINT_NUMBER is not specified, the system will use <a class="route-link" href="/UserGuide/V1.1.x/Reference/DataNode-Config-Manual.html">float_precision</a> in the configuration file <code>iotdb-common.properties</code>.</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> TIMESERIES root<span class="token punctuation">.</span>vehicle<span class="token punctuation">.</span>d0<span class="token punctuation">.</span>s0 <span class="token keyword">WITH</span> DATATYPE<span class="token operator">=</span><span class="token keyword">FLOAT</span><span class="token punctuation">,</span> ENCODING<span class="token operator">=</span>RLE<span class="token punctuation">,</span> <span class="token string">&#39;MAX_POINT_NUMBER&#39;</span><span class="token operator">=</span><span class="token string">&#39;2&#39;</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>For Float data value, The data range is (-Integer.MAX_VALUE, Integer.MAX_VALUE), rather than Float.MAX_VALUE, and the max_point_number is 19, caused by the limition of function Math.round(float) in Java.</li><li>For Double data value, The data range is (-Long.MAX_VALUE, Long.MAX_VALUE), rather than Double.MAX_VALUE, and the max_point_number is 19, caused by the limition of function Math.round(double) in Java (Long.MAX_VALUE=9.22E18).</li></ul><h3 id="data-type-compatibility" tabindex="-1"><a class="header-anchor" href="#data-type-compatibility"><span>Data Type Compatibility</span></a></h3><p>When the written data type is inconsistent with the data type of time-series,</p><ul><li>If the data type of time-series is not compatible with the written data type, the system will give an error message.</li><li>If the data type of time-series is compatible with the written data type, the system will automatically convert the data type.</li></ul><p>The compatibility of each data type is shown in the following table:</p><table><thead><tr><th>Series Data Type</th><th>Supported Written Data Types</th></tr></thead><tbody><tr><td>BOOLEAN</td><td>BOOLEAN</td></tr><tr><td>INT32</td><td>INT32</td></tr><tr><td>INT64</td><td>INT32 INT64</td></tr><tr><td>FLOAT</td><td>INT32 FLOAT</td></tr><tr><td>DOUBLE</td><td>INT32 INT64 FLOAT DOUBLE</td></tr><tr><td>TEXT</td><td>TEXT</td></tr></tbody></table><h2 id="timestamp" tabindex="-1"><a class="header-anchor" href="#timestamp"><span>Timestamp</span></a></h2><p>The timestamp is the time point at which data is produced. It includes absolute timestamps and relative timestamps</p><h3 id="absolute-timestamp" tabindex="-1"><a class="header-anchor" href="#absolute-timestamp"><span>Absolute timestamp</span></a></h3><p>Absolute timestamps in IoTDB are divided into two types: LONG and DATETIME (including DATETIME-INPUT and DATETIME-DISPLAY). When a user inputs a timestamp, he can use a LONG type timestamp or a DATETIME-INPUT type timestamp, and the supported formats of the DATETIME-INPUT type timestamp are shown in the table below:</p><div style="text-align:center;"><p><strong>Supported formats of DATETIME-INPUT type timestamp</strong></p><table><thead><tr><th style="text-align:center;">Format</th></tr></thead><tbody><tr><td style="text-align:center;">yyyy-MM-dd HH:mm:ss</td></tr><tr><td style="text-align:center;">yyyy/MM/dd HH:mm:ss</td></tr><tr><td style="text-align:center;">yyyy.MM.dd HH:mm:ss</td></tr><tr><td style="text-align:center;">yyyy-MM-dd HH:mm:ssZZ</td></tr><tr><td style="text-align:center;">yyyy/MM/dd HH:mm:ssZZ</td></tr><tr><td style="text-align:center;">yyyy.MM.dd HH:mm:ssZZ</td></tr><tr><td style="text-align:center;">yyyy/MM/dd HH:mm:ss.SSS</td></tr><tr><td style="text-align:center;">yyyy-MM-dd HH:mm:ss.SSS</td></tr><tr><td style="text-align:center;">yyyy.MM.dd HH:mm:ss.SSS</td></tr><tr><td style="text-align:center;">yyyy-MM-dd HH:mm:ss.SSSZZ</td></tr><tr><td style="text-align:center;">yyyy/MM/dd HH:mm:ss.SSSZZ</td></tr><tr><td style="text-align:center;">yyyy.MM.dd HH:mm:ss.SSSZZ</td></tr><tr><td style="text-align:center;">ISO8601 standard time format</td></tr></tbody></table></div><p>IoTDB can support LONG types and DATETIME-DISPLAY types when displaying timestamps. The DATETIME-DISPLAY type can support user-defined time formats. The syntax of the custom time format is shown in the table below:</p><div style="text-align:center;"><p><strong>The syntax of the custom time format</strong></p><table><thead><tr><th style="text-align:center;">Symbol</th><th style="text-align:center;">Meaning</th><th style="text-align:center;">Presentation</th><th style="text-align:center;">Examples</th></tr></thead><tbody><tr><td style="text-align:center;">G</td><td style="text-align:center;">era</td><td style="text-align:center;">era</td><td style="text-align:center;">era</td></tr><tr><td style="text-align:center;">C</td><td style="text-align:center;">century of era (&gt;=0)</td><td style="text-align:center;">number</td><td style="text-align:center;">20</td></tr><tr><td style="text-align:center;">Y</td><td style="text-align:center;">year of era (&gt;=0)</td><td style="text-align:center;">year</td><td style="text-align:center;">1996</td></tr><tr><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">x</td><td style="text-align:center;">weekyear</td><td style="text-align:center;">year</td><td style="text-align:center;">1996</td></tr><tr><td style="text-align:center;">w</td><td style="text-align:center;">week of weekyear</td><td style="text-align:center;">number</td><td style="text-align:center;">27</td></tr><tr><td style="text-align:center;">e</td><td style="text-align:center;">day of week</td><td style="text-align:center;">number</td><td style="text-align:center;">2</td></tr><tr><td style="text-align:center;">E</td><td style="text-align:center;">day of week</td><td style="text-align:center;">text</td><td style="text-align:center;">Tuesday; Tue</td></tr><tr><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">y</td><td style="text-align:center;">year</td><td style="text-align:center;">year</td><td style="text-align:center;">1996</td></tr><tr><td style="text-align:center;">D</td><td style="text-align:center;">day of year</td><td style="text-align:center;">number</td><td style="text-align:center;">189</td></tr><tr><td style="text-align:center;">M</td><td style="text-align:center;">month of year</td><td style="text-align:center;">month</td><td style="text-align:center;">July; Jul; 07</td></tr><tr><td style="text-align:center;">d</td><td style="text-align:center;">day of month</td><td style="text-align:center;">number</td><td style="text-align:center;">10</td></tr><tr><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">a</td><td style="text-align:center;">halfday of day</td><td style="text-align:center;">text</td><td style="text-align:center;">PM</td></tr><tr><td style="text-align:center;">K</td><td style="text-align:center;">hour of halfday (0~11)</td><td style="text-align:center;">number</td><td style="text-align:center;">0</td></tr><tr><td style="text-align:center;">h</td><td style="text-align:center;">clockhour of halfday (1~12)</td><td style="text-align:center;">number</td><td style="text-align:center;">12</td></tr><tr><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">H</td><td style="text-align:center;">hour of day (0~23)</td><td style="text-align:center;">number</td><td style="text-align:center;">0</td></tr><tr><td style="text-align:center;">k</td><td style="text-align:center;">clockhour of day (1~24)</td><td style="text-align:center;">number</td><td style="text-align:center;">24</td></tr><tr><td style="text-align:center;">m</td><td style="text-align:center;">minute of hour</td><td style="text-align:center;">number</td><td style="text-align:center;">30</td></tr><tr><td style="text-align:center;">s</td><td style="text-align:center;">second of minute</td><td style="text-align:center;">number</td><td style="text-align:center;">55</td></tr><tr><td style="text-align:center;">S</td><td style="text-align:center;">fraction of second</td><td style="text-align:center;">millis</td><td style="text-align:center;">978</td></tr><tr><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">z</td><td style="text-align:center;">time zone</td><td style="text-align:center;">text</td><td style="text-align:center;">Pacific Standard Time; PST</td></tr><tr><td style="text-align:center;">Z</td><td style="text-align:center;">time zone offset/id</td><td style="text-align:center;">zone</td><td style="text-align:center;">-0800; -08:00; America/Los_Angeles</td></tr><tr><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">&#39;</td><td style="text-align:center;">escape for text</td><td style="text-align:center;">delimiter</td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">&#39;&#39;</td><td style="text-align:center;">single quote</td><td style="text-align:center;">literal</td><td style="text-align:center;">&#39;</td></tr></tbody></table></div><h3 id="relative-timestamp" tabindex="-1"><a class="header-anchor" href="#relative-timestamp"><span>Relative timestamp</span></a></h3><p>Relative time refers to the time relative to the server time <code>now()</code> and <code>DATETIME</code> time.</p><p>Syntax:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code> Duration = (Digit+ (&#39;Y&#39;|&#39;MO&#39;|&#39;W&#39;|&#39;D&#39;|&#39;H&#39;|&#39;M&#39;|&#39;S&#39;|&#39;MS&#39;|&#39;US&#39;|&#39;NS&#39;))+
 RelativeTime = (now() | DATETIME) ((+|-) Duration)+
       
</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></div> <div style="text-align:center;"><p><strong>The syntax of the duration unit</strong></p><table><thead><tr><th style="text-align:center;">Symbol</th><th style="text-align:center;">Meaning</th><th style="text-align:center;">Presentation</th><th style="text-align:center;">Examples</th></tr></thead><tbody><tr><td style="text-align:center;">y</td><td style="text-align:center;">year</td><td style="text-align:center;">1y=365 days</td><td style="text-align:center;">1y</td></tr><tr><td style="text-align:center;">mo</td><td style="text-align:center;">month</td><td style="text-align:center;">1mo=30 days</td><td style="text-align:center;">1mo</td></tr><tr><td style="text-align:center;">w</td><td style="text-align:center;">week</td><td style="text-align:center;">1w=7 days</td><td style="text-align:center;">1w</td></tr><tr><td style="text-align:center;">d</td><td style="text-align:center;">day</td><td style="text-align:center;">1d=1 day</td><td style="text-align:center;">1d</td></tr><tr><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">h</td><td style="text-align:center;">hour</td><td style="text-align:center;">1h=3600 seconds</td><td style="text-align:center;">1h</td></tr><tr><td style="text-align:center;">m</td><td style="text-align:center;">minute</td><td style="text-align:center;">1m=60 seconds</td><td style="text-align:center;">1m</td></tr><tr><td style="text-align:center;">s</td><td style="text-align:center;">second</td><td style="text-align:center;">1s=1 second</td><td style="text-align:center;">1s</td></tr><tr><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td><td style="text-align:center;"></td></tr><tr><td style="text-align:center;">ms</td><td style="text-align:center;">millisecond</td><td style="text-align:center;">1ms=1000_000 nanoseconds</td><td style="text-align:center;">1ms</td></tr><tr><td style="text-align:center;">us</td><td style="text-align:center;">microsecond</td><td style="text-align:center;">1us=1000 nanoseconds</td><td style="text-align:center;">1us</td></tr><tr><td style="text-align:center;">ns</td><td style="text-align:center;">nanosecond</td><td style="text-align:center;">1ns=1 nanosecond</td><td style="text-align:center;">1ns</td></tr></tbody></table></div><p>eg：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>now() - 1d2h //1 day and 2 hours earlier than the current server time
now() - 1w //1 week earlier than the current server time
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><blockquote><p>Note：There must be spaces on the left and right of &#39;+&#39; and &#39;-&#39;.</p></blockquote></div><!--[--><!----><!--]--><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/UserGuide/V1.1.x/Data-Concept/Data-Type.md" rel="noopener noreferrer" target="_blank" aria-label="Found Error? Edit this page on GitHub" class="nav-link vp-meta-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><!--]-->Found Error? Edit this page on GitHub<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="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">Last update: </span><!----></div><!----></div></footer><nav class="vp-page-nav"><a class="route-link nav-link prev" href="/UserGuide/V1.1.x/Data-Concept/Schema-Template.html" aria-label="Schema Template"><div class="hint"><span class="arrow start"></span>Prev</div><div class="link"><!---->Schema Template</div></a><a class="route-link nav-link next" href="/UserGuide/V1.1.x/Data-Concept/Deadband-Process.html" aria-label="Deadband Process"><div class="hint">Next<span class="arrow end"></span></div><div class="link">Deadband Process<!----></div></a></nav><!----><!--[--><!----><!--]--><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">rel/1.1</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2024 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></footer></div><!--]--><!--]--><!--[--><!----><!--]--><!--]--></div>
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