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<h1 id="tutorial-querying-data">Tutorial: Querying data</h1>
<p>This tutorial will demonstrate how to query data in Apache Druid (incubating), with examples for Druid SQL and Druid&#39;s native query format.</p>
<p>The tutorial assumes that you&#39;ve already completed one of the 4 ingestion tutorials, as we will be querying the sample Wikipedia edits data.</p>
<ul>
<li><a href="../tutorials/tutorial-batch.html">Tutorial: Loading a file</a></li>
<li><a href="../tutorials/tutorial-kafka.html">Tutorial: Loading stream data from Kafka</a></li>
<li><a href="../tutorials/tutorial-batch-hadoop.html">Tutorial: Loading a file using Hadoop</a></li>
<li><a href="../tutorials/tutorial-tranquility.html">Tutorial: Loading stream data using Tranquility</a></li>
</ul>
<p>Druid queries are sent over HTTP.
The Druid console includes a view to issue queries to Druid and nicely format the results. </p>
<h2 id="druid-sql-queries">Druid SQL queries</h2>
<p>Druid supports a dialect of SQL for querying.</p>
<p>This query retrieves the 10 Wikipedia pages with the most page edits on 2015-09-12.</p>
<div class="highlight"><pre><code class="language-sql" data-lang="sql"><span></span><span class="k">SELECT</span> <span class="n">page</span><span class="p">,</span> <span class="k">COUNT</span><span class="p">(</span><span class="o">*</span><span class="p">)</span> <span class="k">AS</span> <span class="n">Edits</span>
<span class="k">FROM</span> <span class="n">wikipedia</span>
<span class="k">WHERE</span> <span class="ss">&quot;__time&quot;</span> <span class="k">BETWEEN</span> <span class="k">TIMESTAMP</span> <span class="s1">&#39;2015-09-12 00:00:00&#39;</span> <span class="k">AND</span> <span class="k">TIMESTAMP</span> <span class="s1">&#39;2015-09-13 00:00:00&#39;</span>
<span class="k">GROUP</span> <span class="k">BY</span> <span class="n">page</span> <span class="k">ORDER</span> <span class="k">BY</span> <span class="n">Edits</span> <span class="k">DESC</span>
<span class="k">LIMIT</span> <span class="mi">10</span>
</code></pre></div>
<p>Let&#39;s look at the different ways to issue this query.</p>
<h3 id="query-sql-via-the-console">Query SQL via the console</h3>
<p>You can issue the above query from the console.</p>
<p><img src="../tutorials/img/tutorial-query-01.png" alt="Query autocomplete" title="Query autocomplete"></p>
<p>The console query view provides autocomplete together with inline function documentation.
You can also configure extra context flags to be sent with the query from the more options menu.</p>
<p><img src="../tutorials/img/tutorial-query-02.png" alt="Query options" title="Query options"></p>
<p>Note that the console will by default wrap your SQL queries in a limit so that you can issue queries like <code>SELECT * FROM wikipedia</code> without much hesitation - you can turn off this behaviour. </p>
<h3 id="query-sql-via-dsql">Query SQL via dsql</h3>
<p>For convenience, the Druid package includes a SQL command-line client, located at <code>bin/dsql</code> from the Druid package root.</p>
<p>Let&#39;s now run <code>bin/dsql</code>; you should see the following prompt:</p>
<div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>Welcome to dsql, the command-line client <span class="k">for</span> Druid SQL.
Type <span class="s2">&quot;\h&quot;</span> <span class="k">for</span> help.
dsql&gt;
</code></pre></div>
<p>To submit the query, paste it to the <code>dsql</code> prompt and press enter:</p>
<div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>dsql&gt; SELECT page, COUNT<span class="o">(</span>*<span class="o">)</span> AS Edits FROM wikipedia WHERE <span class="s2">&quot;__time&quot;</span> BETWEEN TIMESTAMP <span class="s1">&#39;2015-09-12 00:00:00&#39;</span> AND TIMESTAMP <span class="s1">&#39;2015-09-13 00:00:00&#39;</span> GROUP BY page ORDER BY Edits DESC LIMIT <span class="m">10</span><span class="p">;</span>
┌──────────────────────────────────────────────────────────┬───────┐
│ page │ Edits │
├──────────────────────────────────────────────────────────┼───────┤
│ Wikipedia:Vandalismusmeldung │ <span class="m">33</span>
│ User:Cyde/List of candidates <span class="k">for</span> speedy deletion/Subpage │ <span class="m">28</span>
│ Jeremy Corbyn │ <span class="m">27</span>
│ Wikipedia:Administrators<span class="err">&#39;</span> noticeboard/Incidents │ <span class="m">21</span>
│ Flavia Pennetta │ <span class="m">20</span>
│ Total Drama Presents: The Ridonculous Race │ <span class="m">18</span>
│ User talk:Dudeperson176123 │ <span class="m">18</span>
│ Wikipédia:Le Bistro/12 septembre <span class="m">2015</span><span class="m">18</span>
│ Wikipedia:In the news/Candidates │ <span class="m">17</span>
│ Wikipedia:Requests <span class="k">for</span> page protection │ <span class="m">17</span>
└──────────────────────────────────────────────────────────┴───────┘
Retrieved <span class="m">10</span> rows in <span class="m">0</span>.06s.
</code></pre></div>
<h3 id="query-sql-over-http">Query SQL over HTTP</h3>
<p>The SQL queries are submitted as JSON over HTTP.</p>
<p>The tutorial package includes an example file that contains the SQL query shown above at <code>quickstart/tutorial/wikipedia-top-pages-sql.json</code>. Let&#39;s submit that query to the Druid Broker:</p>
<div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>curl -X <span class="s1">&#39;POST&#39;</span> -H <span class="s1">&#39;Content-Type:application/json&#39;</span> -d @quickstart/tutorial/wikipedia-top-pages-sql.json http://localhost:8888/druid/v2/sql
</code></pre></div>
<p>The following results should be returned:</p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="p">[</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;Wikipedia:Vandalismusmeldung&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">33</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;User:Cyde/List of candidates for speedy deletion/Subpage&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">28</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;Jeremy Corbyn&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">27</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;Wikipedia:Administrators&#39; noticeboard/Incidents&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">21</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;Flavia Pennetta&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">20</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;Total Drama Presents: The Ridonculous Race&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">18</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;User talk:Dudeperson176123&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">18</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;Wikipédia:Le Bistro/12 septembre 2015&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">18</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;Wikipedia:In the news/Candidates&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">17</span>
<span class="p">},</span>
<span class="p">{</span>
<span class="nt">&quot;page&quot;</span><span class="p">:</span> <span class="s2">&quot;Wikipedia:Requests for page protection&quot;</span><span class="p">,</span>
<span class="nt">&quot;Edits&quot;</span><span class="p">:</span> <span class="mi">17</span>
<span class="p">}</span>
<span class="p">]</span>
</code></pre></div>
<h3 id="more-druid-sql-examples">More Druid SQL examples</h3>
<p>Here is a collection of queries to try out:</p>
<h4 id="query-over-time">Query over time</h4>
<div class="highlight"><pre><code class="language-sql" data-lang="sql"><span></span><span class="k">SELECT</span> <span class="n">FLOOR</span><span class="p">(</span><span class="n">__time</span> <span class="k">to</span> <span class="n">HOUR</span><span class="p">)</span> <span class="k">AS</span> <span class="n">HourTime</span><span class="p">,</span> <span class="k">SUM</span><span class="p">(</span><span class="n">deleted</span><span class="p">)</span> <span class="k">AS</span> <span class="n">LinesDeleted</span>
<span class="k">FROM</span> <span class="n">wikipedia</span> <span class="k">WHERE</span> <span class="ss">&quot;__time&quot;</span> <span class="k">BETWEEN</span> <span class="k">TIMESTAMP</span> <span class="s1">&#39;2015-09-12 00:00:00&#39;</span> <span class="k">AND</span> <span class="k">TIMESTAMP</span> <span class="s1">&#39;2015-09-13 00:00:00&#39;</span>
<span class="k">GROUP</span> <span class="k">BY</span> <span class="mi">1</span>
</code></pre></div>
<p><img src="../tutorials/img/tutorial-query-03.png" alt="Query example" title="Query example"></p>
<h4 id="general-group-by">General group by</h4>
<div class="highlight"><pre><code class="language-sql" data-lang="sql"><span></span><span class="k">SELECT</span> <span class="n">channel</span><span class="p">,</span> <span class="n">page</span><span class="p">,</span> <span class="k">SUM</span><span class="p">(</span><span class="n">added</span><span class="p">)</span>
<span class="k">FROM</span> <span class="n">wikipedia</span> <span class="k">WHERE</span> <span class="ss">&quot;__time&quot;</span> <span class="k">BETWEEN</span> <span class="k">TIMESTAMP</span> <span class="s1">&#39;2015-09-12 00:00:00&#39;</span> <span class="k">AND</span> <span class="k">TIMESTAMP</span> <span class="s1">&#39;2015-09-13 00:00:00&#39;</span>
<span class="k">GROUP</span> <span class="k">BY</span> <span class="n">channel</span><span class="p">,</span> <span class="n">page</span>
<span class="k">ORDER</span> <span class="k">BY</span> <span class="k">SUM</span><span class="p">(</span><span class="n">added</span><span class="p">)</span> <span class="k">DESC</span>
</code></pre></div>
<p><img src="../tutorials/img/tutorial-query-04.png" alt="Query example" title="Query example"></p>
<h4 id="select-raw-data">Select raw data</h4>
<div class="highlight"><pre><code class="language-sql" data-lang="sql"><span></span><span class="k">SELECT</span> <span class="k">user</span><span class="p">,</span> <span class="n">page</span>
<span class="k">FROM</span> <span class="n">wikipedia</span> <span class="k">WHERE</span> <span class="ss">&quot;__time&quot;</span> <span class="k">BETWEEN</span> <span class="k">TIMESTAMP</span> <span class="s1">&#39;2015-09-12 02:00:00&#39;</span> <span class="k">AND</span> <span class="k">TIMESTAMP</span> <span class="s1">&#39;2015-09-12 03:00:00&#39;</span>
<span class="k">LIMIT</span> <span class="mi">5</span>
</code></pre></div>
<p><img src="../tutorials/img/tutorial-query-05.png" alt="Query example" title="Query example"></p>
<h3 id="explain-query-plan">Explain query plan</h3>
<p>Druid SQL has the ability to explain the query plan for a given query.
In the console this functionality is accessible from the <code>...</code> button.</p>
<p><img src="../tutorials/img/tutorial-query-06.png" alt="Explain query" title="Explain query"></p>
<p>If you are querying in other ways you can get the plan by prepending <code>EXPLAIN PLAN FOR</code> to a Druid SQL query.</p>
<p>Using a query from an example above:</p>
<p><code>EXPLAIN PLAN FOR SELECT page, COUNT(*) AS Edits FROM wikipedia WHERE &quot;__time&quot; BETWEEN TIMESTAMP &#39;2015-09-12 00:00:00&#39; AND TIMESTAMP &#39;2015-09-13 00:00:00&#39; GROUP BY page ORDER BY Edits DESC LIMIT 10;</code></p>
<div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>dsql&gt; EXPLAIN PLAN FOR SELECT page, COUNT<span class="o">(</span>*<span class="o">)</span> AS Edits FROM wikipedia WHERE <span class="s2">&quot;__time&quot;</span> BETWEEN TIMESTAMP <span class="s1">&#39;2015-09-12 00:00:00&#39;</span> AND TIMESTAMP <span class="s1">&#39;2015-09-13 00:00:00&#39;</span> GROUP BY page ORDER BY Edits DESC LIMIT <span class="m">10</span><span class="p">;</span>
┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ PLAN │
├─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ DruidQueryRel<span class="o">(</span><span class="nv">query</span><span class="o">=[{</span><span class="s2">&quot;queryType&quot;</span>:<span class="s2">&quot;topN&quot;</span>,<span class="s2">&quot;dataSource&quot;</span>:<span class="o">{</span><span class="s2">&quot;type&quot;</span>:<span class="s2">&quot;table&quot;</span>,<span class="s2">&quot;name&quot;</span>:<span class="s2">&quot;wikipedia&quot;</span><span class="o">}</span>,<span class="s2">&quot;virtualColumns&quot;</span>:<span class="o">[]</span>,<span class="s2">&quot;dimension&quot;</span>:<span class="o">{</span><span class="s2">&quot;type&quot;</span>:<span class="s2">&quot;default&quot;</span>,<span class="s2">&quot;dimension&quot;</span>:<span class="s2">&quot;page&quot;</span>,<span class="s2">&quot;outputName&quot;</span>:<span class="s2">&quot;d0&quot;</span>,<span class="s2">&quot;outputType&quot;</span>:<span class="s2">&quot;STRING&quot;</span><span class="o">}</span>,<span class="s2">&quot;metric&quot;</span>:<span class="o">{</span><span class="s2">&quot;type&quot;</span>:<span class="s2">&quot;numeric&quot;</span>,<span class="s2">&quot;metric&quot;</span>:<span class="s2">&quot;a0&quot;</span><span class="o">}</span>,<span class="s2">&quot;threshold&quot;</span>:10,<span class="s2">&quot;intervals&quot;</span>:<span class="o">{</span><span class="s2">&quot;type&quot;</span>:<span class="s2">&quot;intervals&quot;</span>,<span class="s2">&quot;intervals&quot;</span>:<span class="o">[</span><span class="s2">&quot;2015-09-12T00:00:00.000Z/2015-09-13T00:00:00.001Z&quot;</span><span class="o">]}</span>,<span class="s2">&quot;filter&quot;</span>:null,<span class="s2">&quot;granularity&quot;</span>:<span class="o">{</span><span class="s2">&quot;type&quot;</span>:<span class="s2">&quot;all&quot;</span><span class="o">}</span>,<span class="s2">&quot;aggregations&quot;</span>:<span class="o">[{</span><span class="s2">&quot;type&quot;</span>:<span class="s2">&quot;count&quot;</span>,<span class="s2">&quot;name&quot;</span>:<span class="s2">&quot;a0&quot;</span><span class="o">}]</span>,<span class="s2">&quot;postAggregations&quot;</span>:<span class="o">[]</span>,<span class="s2">&quot;context&quot;</span>:<span class="o">{}</span>,<span class="s2">&quot;descending&quot;</span>:false<span class="o">}]</span>, <span class="nv">signature</span><span class="o">=[{</span>d0:STRING, a0:LONG<span class="o">}])</span>
└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
Retrieved <span class="m">1</span> row in <span class="m">0</span>.03s.
</code></pre></div>
<h2 id="native-json-queries">Native JSON queries</h2>
<p>Druid&#39;s native query format is expressed in JSON.</p>
<h3 id="native-query-via-the-console">Native query via the console</h3>
<p>You can issue native Druid queries from the console&#39;s Query view.</p>
<p>Here is a query that retrieves the 10 Wikipedia pages with the most page edits on 2015-09-12.</p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="p">{</span>
<span class="nt">&quot;queryType&quot;</span> <span class="p">:</span> <span class="s2">&quot;topN&quot;</span><span class="p">,</span>
<span class="nt">&quot;dataSource&quot;</span> <span class="p">:</span> <span class="s2">&quot;wikipedia&quot;</span><span class="p">,</span>
<span class="nt">&quot;intervals&quot;</span> <span class="p">:</span> <span class="p">[</span><span class="s2">&quot;2015-09-12/2015-09-13&quot;</span><span class="p">],</span>
<span class="nt">&quot;granularity&quot;</span> <span class="p">:</span> <span class="s2">&quot;all&quot;</span><span class="p">,</span>
<span class="nt">&quot;dimension&quot;</span> <span class="p">:</span> <span class="s2">&quot;page&quot;</span><span class="p">,</span>
<span class="nt">&quot;metric&quot;</span> <span class="p">:</span> <span class="s2">&quot;count&quot;</span><span class="p">,</span>
<span class="nt">&quot;threshold&quot;</span> <span class="p">:</span> <span class="mi">10</span><span class="p">,</span>
<span class="nt">&quot;aggregations&quot;</span> <span class="p">:</span> <span class="p">[</span>
<span class="p">{</span>
<span class="nt">&quot;type&quot;</span> <span class="p">:</span> <span class="s2">&quot;count&quot;</span><span class="p">,</span>
<span class="nt">&quot;name&quot;</span> <span class="p">:</span> <span class="s2">&quot;count&quot;</span>
<span class="p">}</span>
<span class="p">]</span>
<span class="p">}</span>
</code></pre></div>
<p>Simply paste it into the console to switch the editor into JSON mode.</p>
<p><img src="../tutorials/img/tutorial-query-07.png" alt="Native query" title="Native query"></p>
<h3 id="native-queries-over-http">Native queries over HTTP</h3>
<p>We have included a sample native TopN query under <code>quickstart/tutorial/wikipedia-top-pages.json</code>:</p>
<p>Let&#39;s submit this query to Druid:</p>
<div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>curl -X <span class="s1">&#39;POST&#39;</span> -H <span class="s1">&#39;Content-Type:application/json&#39;</span> -d @quickstart/tutorial/wikipedia-top-pages.json http://localhost:8888/druid/v2?pretty
</code></pre></div>
<p>You should see the following query results:</p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="p">[</span> <span class="p">{</span>
<span class="nt">&quot;timestamp&quot;</span> <span class="p">:</span> <span class="s2">&quot;2015-09-12T00:46:58.771Z&quot;</span><span class="p">,</span>
<span class="nt">&quot;result&quot;</span> <span class="p">:</span> <span class="p">[</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">33</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;Wikipedia:Vandalismusmeldung&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">28</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;User:Cyde/List of candidates for speedy deletion/Subpage&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">27</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;Jeremy Corbyn&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">21</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;Wikipedia:Administrators&#39; noticeboard/Incidents&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">20</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;Flavia Pennetta&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">18</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;Total Drama Presents: The Ridonculous Race&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">18</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;User talk:Dudeperson176123&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">18</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;Wikipédia:Le Bistro/12 septembre 2015&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">17</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;Wikipedia:In the news/Candidates&quot;</span>
<span class="p">},</span> <span class="p">{</span>
<span class="nt">&quot;count&quot;</span> <span class="p">:</span> <span class="mi">17</span><span class="p">,</span>
<span class="nt">&quot;page&quot;</span> <span class="p">:</span> <span class="s2">&quot;Wikipedia:Requests for page protection&quot;</span>
<span class="p">}</span> <span class="p">]</span>
<span class="p">}</span> <span class="p">]</span>
</code></pre></div>
<h2 id="further-reading">Further reading</h2>
<p>The <a href="../querying/querying.html">Queries documentation</a> has more information on Druid&#39;s native JSON queries.</p>
<p>The <a href="../querying/sql.html">Druid SQL documentation</a> has more information on using Druid SQL queries.</p>
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