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class="page"> <div class="content content__default"><h1 id="fill-null-value"><a href="#fill-null-value" class="header-anchor">#</a> Fill Null Value</h1> <p>When executing some queries, there may be no data for some columns in some rows, and data in these locations will be null, but this kind of null value is not conducive to data visualization and analysis, and the null value needs to be filled.</p> <p>Fill null value allows the user to fill any query result with null values according to a specific method, such as taking the previous value that is not null, or linear interpolation. The query result after filling the null value can better reflect the data distribution, which is beneficial for users to perform data analysis.</p> <p>In IoTDB, users can use the FILL clause to specify the fill mode when data is missing. If the queried point's value is not null, the fill function will not work.</p> <h2 id="fill-methods"><a href="#fill-methods" class="header-anchor">#</a> Fill Methods</h2> <p>IoTDB supports previous, linear, and value fill methods. Following table lists the data types and supported fill methods.</p> <table><thead><tr><th style="text-align:left;">Data Type</th> <th style="text-align:left;">Supported Fill Methods</th></tr></thead> <tbody><tr><td style="text-align:left;">boolean</td> <td style="text-align:left;">previous, value</td></tr> <tr><td style="text-align:left;">int32</td> <td style="text-align:left;">previous, linear, value</td></tr> <tr><td style="text-align:left;">int64</td> <td style="text-align:left;">previous, linear, value</td></tr> <tr><td style="text-align:left;">float</td> <td style="text-align:left;">previous, linear, value</td></tr> <tr><td style="text-align:left;">double</td> <td style="text-align:left;">previous, linear, value</td></tr> <tr><td style="text-align:left;">text</td> <td style="text-align:left;">previous, value</td></tr> <tr><td style="text-align:left;"></td> <td style="text-align:left;"></td></tr></tbody></table> <blockquote><p>Note: Only one Fill method can be specified in a Fill statement. Null value fill is not compatible with version 0.13 and previous syntax (fill((<data_type>[<fill_method>(, <before_range>, <after_range>)?])+)) is not supported anymore.</p></blockquote> <h3 id="previous-fill"><a href="#previous-fill" class="header-anchor">#</a> Previous Fill</h3> <p>When the value is null, the value of the previous timestamp is used to fill the blank. The formalized previous method is as follows:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>fill<span class="token punctuation">(</span>previous<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Here we give an example of filling null values using the previous method. The SQL statement is as follows:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> temperature<span class="token punctuation">,</span> <span class="token keyword">status</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>sgcc<span class="token punctuation">.</span>wf03<span class="token punctuation">.</span>wt01 <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">=</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>T16:<span class="token number">37</span>:<span class="token number">00.000</span> <span class="token operator">and</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>T16:<span class="token number">40</span>:<span class="token number">00.000</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>if we don't use any fill methods, the original result will be like:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------------------------+--------------------------+ |
| | Time|root.sgcc.wf03.wt01.temperature|root.sgcc.wf03.wt01.status| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:37:00.000+08:00| 21.93| true| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:38:00.000+08:00| null| false| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:39:00.000+08:00| 22.23| null| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:40:00.000+08:00| 23.43| null| |
| +-----------------------------+-------------------------------+--------------------------+ |
| Total line number = 4 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><p>if we use previous fill, sql will be like:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> temperature <span class="token keyword">from</span> root<span class="token punctuation">.</span>sgcc<span class="token punctuation">.</span>wf03<span class="token punctuation">.</span>wt01 <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">=</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>T16:<span class="token number">37</span>:<span class="token number">00.000</span> <span class="token operator">and</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>T16:<span class="token number">40</span>:<span class="token number">00.000</span> fill<span class="token punctuation">(</span>previous<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>previous filled result will be like:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------------------------+--------------------------+ |
| | Time|root.sgcc.wf03.wt01.temperature|root.sgcc.wf03.wt01.status| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:37:00.000+08:00| 21.93| true| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:38:00.000+08:00| 21.93| false| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:39:00.000+08:00| 22.23| false| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:40:00.000+08:00| 23.43| false| |
| +-----------------------------+-------------------------------+--------------------------+ |
| Total line number = 4 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><blockquote><p>Note: If the first value of this column is null, we will keep first value as null and won't fill it until we meet first non-null value</p></blockquote> <h3 id="linear-fill"><a href="#linear-fill" class="header-anchor">#</a> Linear Fill</h3> <p>When the value in the queried timestamp is null, the value of the previous and the next timestamp is used to fill the blank. The formalized linear method is as follows:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>fill<span class="token punctuation">(</span>linear<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Here we give an example of filling null values using the linear method. The SQL statement is as follows:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> temperature <span class="token keyword">from</span> root<span class="token punctuation">.</span>sgcc<span class="token punctuation">.</span>wf03<span class="token punctuation">.</span>wt01 <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">=</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>T16:<span class="token number">37</span>:<span class="token number">00.000</span> <span class="token operator">and</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>T16:<span class="token number">40</span>:<span class="token number">00.000</span> fill<span class="token punctuation">(</span>linear<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>linear filled result will be like:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------------------------+--------------------------+ |
| | Time|root.sgcc.wf03.wt01.temperature|root.sgcc.wf03.wt01.status| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:37:00.000+08:00| 21.93| true| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:38:00.000+08:00| 22.08| false| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:39:00.000+08:00| 22.23| null| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:40:00.000+08:00| 23.43| null| |
| +-----------------------------+-------------------------------+--------------------------+ |
| Total line number = 4 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><blockquote><p>Note: If all the values before current value are null or all the values after current value are null, we will keep current value as null and won't fill it. |
| Note: If the column's data type is boolean/text, we neither fill it nor throw exception, just keep it as it is.</p></blockquote> <h3 id="value-fill"><a href="#value-fill" class="header-anchor">#</a> Value Fill</h3> <p>When the value in the queried timestamp is null, given fill value is used to fill the blank. The formalized value method is as follows:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>fill<span class="token punctuation">(</span>constant<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Here we give an example of filling null values using the value method. The SQL statement is as follows:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> temperature <span class="token keyword">from</span> root<span class="token punctuation">.</span>sgcc<span class="token punctuation">.</span>wf03<span class="token punctuation">.</span>wt01 <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>T16:<span class="token number">37</span>:<span class="token number">50.000</span> fill<span class="token punctuation">(</span><span class="token number">2.0</span><span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>float constant filled result will be like:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------------------------+--------------------------+ |
| | Time|root.sgcc.wf03.wt01.temperature|root.sgcc.wf03.wt01.status| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:37:00.000+08:00| 21.93| true| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:38:00.000+08:00| 2.0| false| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:39:00.000+08:00| 22.23| null| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:40:00.000+08:00| 23.43| null| |
| +-----------------------------+-------------------------------+--------------------------+ |
| Total line number = 4 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> temperature <span class="token keyword">from</span> root<span class="token punctuation">.</span>sgcc<span class="token punctuation">.</span>wf03<span class="token punctuation">.</span>wt01 <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>T16:<span class="token number">37</span>:<span class="token number">50.000</span> fill<span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>boolean constant filled result will be like:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------------------------+--------------------------+ |
| | Time|root.sgcc.wf03.wt01.temperature|root.sgcc.wf03.wt01.status| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:37:00.000+08:00| 21.93| true| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:38:00.000+08:00| null| false| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:39:00.000+08:00| 22.23| true| |
| +-----------------------------+-------------------------------+--------------------------+ |
| |2017-11-01T16:40:00.000+08:00| 23.43| true| |
| +-----------------------------+-------------------------------+--------------------------+ |
| Total line number = 4 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><blockquote><p>Note: When using the ValueFill, IoTDB neither fill the query result if the data type is different from the input constant nor throw exception, just keep it as it is. |
| Note: If constant value is larger than Integer.MAX_VALUE, IoTDB neither fill the query result if the data type is int32 nor throw exception, just keep it as it is.</p></blockquote> <h4 id="constant-fill-type-consistency"><a href="#constant-fill-type-consistency" class="header-anchor">#</a> Constant Fill Type Consistency</h4> <table><thead><tr><th style="text-align:left;">Constant Value Data Type</th> <th style="text-align:left;">Support Data Type</th></tr></thead> <tbody><tr><td style="text-align:left;">boolean</td> <td style="text-align:left;">boolean, text</td></tr> <tr><td style="text-align:left;">int64</td> <td style="text-align:left;">int32, int64, float, double, text</td></tr> <tr><td style="text-align:left;">double</td> <td style="text-align:left;">float, double, text</td></tr> <tr><td style="text-align:left;">text</td> <td style="text-align:left;">text</td></tr> <tr><td style="text-align:left;"></td> <td style="text-align:left;"></td></tr></tbody></table></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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