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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/sql-reference/aggregate-functions.adoc" target="_blank">Edit</a>
<h1>Aggregate Functions</h1>
<div class="sect1">
<h2 id="avg">AVG</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">AVG</span> <span class="p">([</span><span class="k">DISTINCT</span><span class="p">]</span> <span class="n">expression</span><span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>The average (mean) value. If no rows are selected, the result is <code>NULL</code>. Aggregates are only allowed in select statements. The returned value is of the same data type as the parameter.</p>
</div>
<div class="sect2">
<h3 id="parameters">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><code>DISTINCT</code> - optional keyword. If presents, will average the unique values.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="examples">Examples</h3>
<div class="paragraph">
<p>Calculating average players' age:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">SELECT</span> <span class="k">AVG</span><span class="p">(</span><span class="n">age</span><span class="p">)</span> <span class="nv">"AverageAge"</span> <span class="k">FROM</span> <span class="n">Players</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="bit_and">BIT_AND</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="n">BIT_AND</span> <span class="p">(</span><span class="n">expression</span><span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>The bitwise AND of all non-null values. If no rows are selected, the result is NULL. Aggregates are only allowed in select statements.</p>
</div>
<div class="paragraph">
<p>A logical AND operation is performed on each pair of corresponding bits of two binary expressions of equal length.</p>
</div>
<div class="paragraph">
<p>In each pair, it returns 1 if the first bit is 1 AND the second bit is 1. Else, it returns 0.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="bit_or">BIT_OR</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="n">BIT_OR</span> <span class="p">(</span><span class="n">expression</span><span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>The bitwise OR of all non-null values. If no rows are selected, the result is NULL. Aggregates are only allowed in select statements.</p>
</div>
<div class="paragraph">
<p>A logical OR operation is performed on each pair of corresponding bits of two binary expressions of equal length.</p>
</div>
<div class="paragraph">
<p>In each pair, the result is 1 if the first bit is 1 OR the second bit is 1 OR both bits are 1, and otherwise the result is 0.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="count">COUNT</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">COUNT</span> <span class="p">(</span><span class="o">*</span> <span class="o">|</span> <span class="p">[</span><span class="k">DISTINCT</span><span class="p">]</span> <span class="n">expression</span><span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>The count of all entries or of the non-null values. This method returns a long. If no entries are selected, the result is 0. Aggregates are only allowed in select statements.</p>
</div>
<div class="sect2">
<h3 id="example">Example</h3>
<div class="paragraph">
<p>Calculate the number of players in every city:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">SELECT</span> <span class="n">city_id</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">FROM</span> <span class="n">Players</span> <span class="k">GROUP</span> <span class="k">BY</span> <span class="n">city_id</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="firstvalue">FIRSTVALUE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="n">FIRSTVALUE</span> <span class="p">([</span><span class="k">DISTINCT</span><span class="p">]</span> <span class="o">&lt;</span><span class="n">expression1</span><span class="o">&gt;</span><span class="p">,</span> <span class="o">&lt;</span><span class="n">expression2</span><span class="o">&gt;</span><span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Returns the value of <code>expression1</code> associated with the smallest value of <code>expression2</code> for each group defined by the <code>group by</code> expression in the query.
This function can only be used with colocated data and you have to use the <code>collocated</code> flag when executing the query.</p>
</div>
<div class="paragraph">
<p>The colocated hint can be set as follows:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>SqlFieldsQuery.collocated = true</code> if you use the <a href="/docs/2.9.0/SQL/sql-api">SQL API</a> to execute queries.</p>
</li>
<li>
<p><a href="/docs/2.9.0/SQL/JDBC/jdbc-driver#parameters">JDBC connection string parameter</a></p>
</li>
<li>
<p><a href="/docs/2.9.0/SQL/ODBC/connection-string-dsn#supported-arguments">ODBC connection string argument</a></p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="example-2">Example</h3>
<div class="paragraph">
<p>The example returns</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">select</span> <span class="n">company_id</span><span class="p">,</span> <span class="n">firstvalue</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">age</span><span class="p">)</span> <span class="k">as</span> <span class="n">youngest</span> <span class="k">from</span> <span class="n">person</span> <span class="k">group</span> <span class="k">by</span> <span class="n">company_id</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="group_concat">GROUP_CONCAT</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="n">GROUP_CONCAT</span><span class="p">([</span><span class="k">DISTINCT</span><span class="p">]</span> <span class="n">expression</span> <span class="o">||</span> <span class="p">[</span><span class="n">expression</span> <span class="o">||</span> <span class="p">[</span><span class="n">expression</span> <span class="p">...]]</span>
<span class="p">[</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">expression</span> <span class="p">[</span><span class="k">ASC</span><span class="o">|</span><span class="k">DESC</span><span class="p">],</span> <span class="p">[[</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">expression</span> <span class="p">[</span><span class="k">ASC</span><span class="o">|</span><span class="k">DESC</span><span class="p">]]]</span>
<span class="p">[</span><span class="n">SEPARATOR</span> <span class="n">expression</span><span class="p">])</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Concatenates strings with a separator. The default separator is a ',' (without whitespace). This method returns a string. If no entries are selected, the result is NULL. Aggregates are only allowed in select statements.</p>
</div>
<div class="paragraph">
<p>The <code>expression</code> can be a concatenation of columns and strings using the <code>||</code> operator, for example: <code>column1 || "=" || column2</code>.</p>
</div>
<div class="sect2">
<h3 id="parameters-2">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><code>DISTINCT</code> - filters the result set for unique sets of expressions.</p>
</li>
<li>
<p><code>expression</code> - specifies an expression that may be a column name, a result of another function, or a math operation.</p>
</li>
<li>
<p><code>ORDER BY</code> - orders rows by expression.</p>
</li>
<li>
<p><code>SEPARATOR</code> - overrides a string separator. By default, the separator character is the comma ','.</p>
</li>
</ul>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The <code>DISTINCT</code> and <code>ORDER BY</code> expressions inside the GROUP_CONCAT function are only supported if you group the results by the primary or affinity key (i.e. use <code>GROUP BY</code>). Moreover, you have to tell Ignite that your data is colocated by specifying the <code>collocated=true</code> property in the connection string or by calling <code>SqlFieldsQuery.setCollocated(true)</code> if you use the <a href="https://ignite.apache.org/releases/2.9.0/javadoc/org/apache/ignite/cache/query/SqlFieldsQuery.html#setCollocated-boolean-" target="_blank" rel="noopener">Java API</a>.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="example-3">Example</h3>
<div class="paragraph">
<p>Group all players' names in one row:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">SELECT</span> <span class="n">GROUP_CONCAT</span><span class="p">(</span><span class="n">name</span> <span class="k">ORDER</span> <span class="k">BY</span> <span class="n">id</span> <span class="n">SEPARATOR</span> <span class="s1">', '</span><span class="p">)</span> <span class="k">FROM</span> <span class="n">Players</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="lastvalue">LASTVALUE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="n">LASTVALUE</span> <span class="p">([</span><span class="k">DISTINCT</span><span class="p">]</span> <span class="o">&lt;</span><span class="n">expression1</span><span class="o">&gt;</span><span class="p">,</span> <span class="o">&lt;</span><span class="n">expression2</span><span class="o">&gt;</span><span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Returns the value of <code>expression1</code> associated with the largest value of <code>expression2</code> for each group defined by the <code>group by</code> expression.
This function can only be used with colocated data and you have to use the <code>collocated</code> flag when executing the query.</p>
</div>
<div class="paragraph">
<p>The colocated hint can be set as follows:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>SqlFieldsQuery.collocated = true</code> if you use the <a href="/docs/2.9.0/SQL/sql-api">SQL API</a> to execute queries.</p>
</li>
<li>
<p><a href="/docs/2.9.0/SQL/JDBC/jdbc-driver#parameters">JDBC connection string parameter</a></p>
</li>
<li>
<p><a href="/docs/2.9.0/SQL/ODBC/connection-string-dsn#supported-arguments">ODBC connection string argument</a></p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="example-4">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">select</span> <span class="n">company_id</span><span class="p">,</span> <span class="n">lastvalue</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">age</span><span class="p">)</span> <span class="k">as</span> <span class="n">oldest</span> <span class="k">from</span> <span class="n">person</span> <span class="k">group</span> <span class="k">by</span> <span class="n">company_id</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="max">MAX</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">MAX</span> <span class="p">(</span><span class="n">expression</span><span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Returns the highest value. If no entries are selected, the result is NULL. Aggregates are only allowed in select statements. The returned value is of the same data type as the parameter.</p>
</div>
<div class="sect2">
<h3 id="parameters-3">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><code>expression</code> - may be a column name, a result of another function, or a math operation.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="example-5">Example</h3>
<div class="paragraph">
<p>Return the height of the ​tallest player:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">SELECT</span> <span class="k">MAX</span><span class="p">(</span><span class="n">height</span><span class="p">)</span> <span class="k">FROM</span> <span class="n">Players</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="min">MIN</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">MIN</span> <span class="p">(</span><span class="n">expression</span><span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Returns the lowest value. If no entries are selected, the result is NULL. Aggregates are only allowed in select statements. The returned value is of the same data type as the parameter.</p>
</div>
<div class="sect2">
<h3 id="parameters-4">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><code>expression</code> - may be a column name, the result of another function, or a math operation.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="example-6">Example</h3>
<div class="paragraph">
<p>Return the age of the youngest player:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">SELECT</span> <span class="k">MIN</span><span class="p">(</span><span class="n">age</span><span class="p">)</span> <span class="k">FROM</span> <span class="n">Players</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="sum">SUM</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">SUM</span> <span class="p">([</span><span class="k">