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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Tutorials</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Update existing data</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Update existing data</h1></header><p>This tutorial shows you how to update data in a datasource by overwriting existing data and adding new data to the datasource.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites"></a></h2><p>Before starting this tutorial, download and run Apache Druid on your local machine as described in |
| the <a href="/docs/latest/tutorials/">single-machine quickstart</a>.</p><p>You should also be familiar with the material in the following tutorials:</p><ul><li><a href="/docs/latest/tutorials/tutorial-batch">Load a file</a></li><li><a href="/docs/latest/tutorials/tutorial-query">Query data</a></li><li><a href="/docs/latest/tutorials/tutorial-rollup">Rollup</a></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="load-initial-data">Load initial data<a href="#load-initial-data" class="hash-link" aria-label="Direct link to Load initial data" title="Direct link to Load initial data"></a></h2><p>Load an initial data set to which you will overwrite and append data.</p><p>The ingestion spec is located at <code>quickstart/tutorial/updates-init-index.json</code>. This spec creates a datasource called <code>updates-tutorial</code> and ingests data from <code>quickstart/tutorial/updates-data.json</code>.</p><p>Submit the ingestion task:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">bin/post-index-task --file quickstart/tutorial/updates-init-index.json --url http://localhost:8081</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Start the SQL command-line client:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">bin/dsql</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Run the following SQL query to retrieve data from <code>updates-tutorial</code>:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">dsql</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> SELECT * FROM </span><span class="token string" style="color:rgb(195, 232, 141)">"updates-tutorial"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">┌──────────────────────────┬──────────┬───────┬────────┐</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ __time │ animal │ count │ number │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">├──────────────────────────┼──────────┼───────┼────────┤</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T01:01:00.000Z │ tiger │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">100</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T03:01:00.000Z │ aardvark │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">42</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T03:01:00.000Z │ giraffe │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">14124</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">└──────────────────────────┴──────────┴───────┴────────┘</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Retrieved </span><span class="token number" style="color:rgb(247, 140, 108)">3</span><span class="token plain"> rows </span><span class="token keyword" style="font-style:italic">in</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain">.42s.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The datasource contains three rows of data with an <code>animal</code> dimension and a <code>number</code> metric.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="overwrite-data">Overwrite data<a href="#overwrite-data" class="hash-link" aria-label="Direct link to Overwrite data" title="Direct link to Overwrite data"></a></h2><p>To overwrite the data, submit another task for the same interval but with different input data.</p><p>The <code>quickstart/tutorial/updates-overwrite-index.json</code> spec performs an overwrite on the <code>updates-tutorial</code> datasource.</p><p>In the overwrite ingestion spec, notice the following:</p><ul><li>The <code>intervals</code> field remains the same: <code>"intervals" : ["2018-01-01/2018-01-03"]</code></li><li>New data is loaded from the local file, <code>quickstart/tutorial/updates-data2.json</code></li><li><code>appendToExisting</code> is set to <code>false</code>, indicating an overwrite task</li></ul><p>Submit the ingestion task to overwrite the data:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">bin/post-index-task --file quickstart/tutorial/updates-overwrite-index.json --url http://localhost:8081</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>When Druid finishes loading the new segment from this overwrite task, run the SELECT query again. |
| In the new results, the <code>tiger</code> row now has the value <code>lion</code>, the <code>aardvark</code> row has a different number, and the <code>giraffe</code> row has been replaced with a <code>bear</code> row.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">dsql</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> SELECT * FROM </span><span class="token string" style="color:rgb(195, 232, 141)">"updates-tutorial"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">┌──────────────────────────┬──────────┬───────┬────────┐</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ __time │ animal │ count │ number │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">├──────────────────────────┼──────────┼───────┼────────┤</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T01:01:00.000Z │ lion │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">100</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T03:01:00.000Z │ aardvark │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">9999</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T04:01:00.000Z │ bear │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">111</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">└──────────────────────────┴──────────┴───────┴────────┘</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Retrieved </span><span class="token number" style="color:rgb(247, 140, 108)">3</span><span class="token plain"> rows </span><span class="token keyword" style="font-style:italic">in</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain">.02s.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="combine-existing-data-with-new-data-and-overwrite">Combine existing data with new data and overwrite<a href="#combine-existing-data-with-new-data-and-overwrite" class="hash-link" aria-label="Direct link to Combine existing data with new data and overwrite" title="Direct link to Combine existing data with new data and overwrite"></a></h2><p>Now append new data to the <code>updates-tutorial</code> datasource from <code>quickstart/tutorial/updates-data3.json</code> using the ingestion spec <code>quickstart/tutorial/updates-append-index.json</code>.</p><p>The spec directs Druid to read from the existing <code>updates-tutorial</code> datasource as well as the <code>quickstart/tutorial/updates-data3.json</code> file. The task combines data from the two input sources, then overwrites the original data with the new combined data.</p><p>Submit that task:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">bin/post-index-task --file quickstart/tutorial/updates-append-index.json --url http://localhost:8081</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>When Druid finishes loading the new segment from this overwrite task, it adds the new rows to the datasource. |
| Run the SELECT query again. Druid automatically rolls up the data at ingestion time, aggregating the data in the <code>lion</code> row:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">dsql</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> SELECT * FROM </span><span class="token string" style="color:rgb(195, 232, 141)">"updates-tutorial"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">┌──────────────────────────┬──────────┬───────┬────────┐</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ __time │ animal │ count │ number │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">├──────────────────────────┼──────────┼───────┼────────┤</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T01:01:00.000Z │ lion │ </span><span class="token number" style="color:rgb(247, 140, 108)">2</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">400</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T03:01:00.000Z │ aardvark │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">9999</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T04:01:00.000Z │ bear │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">111</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T05:01:00.000Z │ mongoose │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">737</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T06:01:00.000Z │ snake │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">1234</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T07:01:00.000Z │ octopus │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">115</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">└──────────────────────────┴──────────┴───────┴────────┘</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Retrieved </span><span class="token number" style="color:rgb(247, 140, 108)">6</span><span class="token plain"> rows </span><span class="token keyword" style="font-style:italic">in</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain">.02s.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="append-data">Append data<a href="#append-data" class="hash-link" aria-label="Direct link to Append data" title="Direct link to Append data"></a></h2><p>Now you append data to the datasource without changing the existing data. |
| Use the ingestion spec located at <code>quickstart/tutorial/updates-append-index2.json</code>.</p><p>The spec directs Druid to ingest data from <code>quickstart/tutorial/updates-data4.json</code> and append it to the <code>updates-tutorial</code> datasource. The property <code>appendToExisting</code> is set to <code>true</code> in this spec.</p><p>Submit the task:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">bin/post-index-task --file quickstart/tutorial/updates-append-index2.json --url http://localhost:8081</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Druid adds two additional rows after <code>octopus</code>. When the task completes, query the data again to see them. |
| Druid doesn't roll up the new <code>bear</code> row with the existing <code>bear</code> row because it stored the new data in a separate segment.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">dsql</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> SELECT * FROM </span><span class="token string" style="color:rgb(195, 232, 141)">"updates-tutorial"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">┌──────────────────────────┬──────────┬───────┬────────┐</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ __time │ animal │ count │ number │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">├──────────────────────────┼──────────┼───────┼────────┤</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T01:01:00.000Z │ lion │ </span><span class="token number" style="color:rgb(247, 140, 108)">2</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">400</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T03:01:00.000Z │ aardvark │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">9999</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T04:01:00.000Z │ bear │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">111</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T05:01:00.000Z │ mongoose │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">737</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T06:01:00.000Z │ snake │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">1234</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T07:01:00.000Z │ octopus │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">115</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T04:01:00.000Z │ bear │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">222</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T09:01:00.000Z │ falcon │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">1241</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">└──────────────────────────┴──────────┴───────┴────────┘</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Retrieved </span><span class="token number" style="color:rgb(247, 140, 108)">8</span><span class="token plain"> rows </span><span class="token keyword" style="font-style:italic">in</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain">.02s.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Run the following groupBy query to see that the <code>bear</code> rows group together at query time:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">dsql</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> SELECT __time, animal, SUM</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"count"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain">, SUM</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"number"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> FROM </span><span class="token string" style="color:rgb(195, 232, 141)">"updates-tutorial"</span><span class="token plain"> GROUP BY __time, animal</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">┌──────────────────────────┬──────────┬────────┬────────┐</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ __time │ animal │ EXPR</span><span class="token variable" style="color:rgb(191, 199, 213)">$2</span><span class="token plain"> │ EXPR</span><span class="token variable" style="color:rgb(191, 199, 213)">$3</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">├──────────────────────────┼──────────┼────────┼────────┤</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T01:01:00.000Z │ lion │ </span><span class="token number" style="color:rgb(247, 140, 108)">2</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">400</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T03:01:00.000Z │ aardvark │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">9999</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T04:01:00.000Z │ bear │ </span><span class="token number" style="color:rgb(247, 140, 108)">2</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">333</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T05:01:00.000Z │ mongoose │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">737</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T06:01:00.000Z │ snake │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">1234</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T07:01:00.000Z │ octopus │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">115</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">2018</span><span class="token plain">-01-01T09:01:00.000Z │ falcon │ </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> │ </span><span class="token number" style="color:rgb(247, 140, 108)">1241</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">└──────────────────────────┴──────────┴────────┴────────┘</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Retrieved </span><span class="token number" style="color:rgb(247, 140, 108)">7</span><span class="token plain"> rows </span><span class="token keyword" style="font-style:italic">in</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain">.23s.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/latest/tutorials/tutorial-retention"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Configure data retention</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/tutorials/tutorial-compaction"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Compact segments</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#prerequisites" 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