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<h1 class="title">Aggregate Functions</h1>
<h3 id="description">Description</h3>
<p>Aggregate functions operate on values across rows to perform mathematical calculations such as sum, average, counting, minimum/maximum values, standard deviation, and estimation, as well as some non-mathematical operations.</p>
<h3 id="syntax">Syntax</h3>
<div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">aggregate_function</span><span class="p">(</span><span class="n">input1</span> <span class="p">[,</span> <span class="n">input2</span><span class="p">,</span> <span class="p">...])</span> <span class="n">FILTER</span> <span class="p">(</span><span class="k">WHERE</span> <span class="n">boolean_expression</span><span class="p">)</span>
</code></pre></div></div>
<h3 id="parameters">Parameters</h3>
<ul>
<li>
<p><strong>aggregate_function</strong></p>
<p>Please refer to the <a href="sql-ref-functions-builtin.html#aggregate-functions">Built-in Aggregation Functions</a> document for a complete list of Spark aggregate functions.</p>
</li>
<li>
<p><strong>boolean_expression</strong></p>
<p>Specifies any expression that evaluates to a result type boolean. Two or more expressions may be combined together using the logical operators ( AND, OR ).</p>
</li>
</ul>
<h3 id="examples">Examples</h3>
<p>Please refer to the <a href="sql-ref-functions-builtin.html#aggregate-functions">Built-in Aggregation Functions</a> document for all the examples of Spark aggregate functions.</p>
<h3 id="ordered-set-aggregate-functions">Ordered-Set Aggregate Functions</h3>
<p>These aggregate Functions use different syntax than the other aggregate functions so that to specify an expression (typically a column name) by which to order the values.</p>
<h4 id="syntax-1">Syntax</h4>
<div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="err">{</span> <span class="n">PERCENTILE_CONT</span> <span class="o">|</span> <span class="n">PERCENTILE_DISC</span> <span class="err">}</span><span class="p">(</span><span class="n">percentile</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="err">{</span> <span class="n">order_by_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">NULLS</span> <span class="err">{</span> <span class="k">FIRST</span> <span class="o">|</span> <span class="k">LAST</span> <span class="err">}</span> <span class="p">]</span> <span class="p">[</span> <span class="p">,</span> <span class="p">...</span> <span class="p">]</span> <span class="err">}</span><span class="p">)</span> <span class="n">FILTER</span> <span class="p">(</span><span class="k">WHERE</span> <span class="n">boolean_expression</span><span class="p">)</span>
</code></pre></div></div>
<h4 id="parameters-1">Parameters</h4>
<ul>
<li>
<p><strong>percentile</strong></p>
<p>The percentile of the value that you want to find. The percentile must be a constant between 0.0 and 1.0.</p>
</li>
<li>
<p><strong>order_by_expression</strong></p>
<p>The expression (typically a column name) by which to order the values before aggregating them.</p>
</li>
<li>
<p><strong>boolean_expression</strong></p>
<p>Specifies any expression that evaluates to a result type boolean. Two or more expressions may be combined together using the logical operators ( AND, OR ).</p>
</li>
</ul>
<h4 id="examples-1">Examples</h4>
<div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">CREATE</span> <span class="k">OR</span> <span class="k">REPLACE</span> <span class="k">TEMPORARY</span> <span class="k">VIEW</span> <span class="n">basic_pays</span> <span class="k">AS</span> <span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="k">VALUES</span>
<span class="p">(</span><span class="s1">'Diane Murphy'</span><span class="p">,</span><span class="s1">'Accounting'</span><span class="p">,</span><span class="mi">8435</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Mary Patterson'</span><span class="p">,</span><span class="s1">'Accounting'</span><span class="p">,</span><span class="mi">9998</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Jeff Firrelli'</span><span class="p">,</span><span class="s1">'Accounting'</span><span class="p">,</span><span class="mi">8992</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'William Patterson'</span><span class="p">,</span><span class="s1">'Accounting'</span><span class="p">,</span><span class="mi">8870</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Gerard Bondur'</span><span class="p">,</span><span class="s1">'Accounting'</span><span class="p">,</span><span class="mi">11472</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Anthony Bow'</span><span class="p">,</span><span class="s1">'Accounting'</span><span class="p">,</span><span class="mi">6627</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Leslie Jennings'</span><span class="p">,</span><span class="s1">'IT'</span><span class="p">,</span><span class="mi">8113</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Leslie Thompson'</span><span class="p">,</span><span class="s1">'IT'</span><span class="p">,</span><span class="mi">5186</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Julie Firrelli'</span><span class="p">,</span><span class="s1">'Sales'</span><span class="p">,</span><span class="mi">9181</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Steve Patterson'</span><span class="p">,</span><span class="s1">'Sales'</span><span class="p">,</span><span class="mi">9441</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Foon Yue Tseng'</span><span class="p">,</span><span class="s1">'Sales'</span><span class="p">,</span><span class="mi">6660</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'George Vanauf'</span><span class="p">,</span><span class="s1">'Sales'</span><span class="p">,</span><span class="mi">10563</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Loui Bondur'</span><span class="p">,</span><span class="s1">'SCM'</span><span class="p">,</span><span class="mi">10449</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Gerard Hernandez'</span><span class="p">,</span><span class="s1">'SCM'</span><span class="p">,</span><span class="mi">6949</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Pamela Castillo'</span><span class="p">,</span><span class="s1">'SCM'</span><span class="p">,</span><span class="mi">11303</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Larry Bott'</span><span class="p">,</span><span class="s1">'SCM'</span><span class="p">,</span><span class="mi">11798</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'Barry Jones'</span><span class="p">,</span><span class="s1">'SCM'</span><span class="p">,</span><span class="mi">10586</span><span class="p">)</span>
<span class="k">AS</span> <span class="n">basic_pays</span><span class="p">(</span><span class="n">employee_name</span><span class="p">,</span> <span class="n">department</span><span class="p">,</span> <span class="n">salary</span><span class="p">);</span>
<span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">basic_pays</span><span class="p">;</span>
<span class="o">+</span><span class="c1">-----------------+----------+------+</span>
<span class="o">|</span> <span class="n">employee_name</span><span class="o">|</span><span class="n">department</span><span class="o">|</span><span class="n">salary</span><span class="o">|</span>
<span class="o">+</span><span class="c1">-----------------+----------+------+</span>
<span class="o">|</span> <span class="n">Anthony</span> <span class="n">Bow</span><span class="o">|</span><span class="n">Accounting</span><span class="o">|</span> <span class="mi">6627</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Barry</span> <span class="n">Jones</span><span class="o">|</span> <span class="n">SCM</span><span class="o">|</span> <span class="mi">10586</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Diane</span> <span class="n">Murphy</span><span class="o">|</span><span class="n">Accounting</span><span class="o">|</span> <span class="mi">8435</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Foon</span> <span class="n">Yue</span> <span class="n">Tseng</span><span class="o">|</span> <span class="n">Sales</span><span class="o">|</span> <span class="mi">6660</span><span class="o">|</span>
<span class="o">|</span> <span class="n">George</span> <span class="n">Vanauf</span><span class="o">|</span> <span class="n">Sales</span><span class="o">|</span> <span class="mi">10563</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Gerard</span> <span class="n">Bondur</span><span class="o">|</span><span class="n">Accounting</span><span class="o">|</span> <span class="mi">11472</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Gerard</span> <span class="n">Hernandez</span><span class="o">|</span> <span class="n">SCM</span><span class="o">|</span> <span class="mi">6949</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Jeff</span> <span class="n">Firrelli</span><span class="o">|</span><span class="n">Accounting</span><span class="o">|</span> <span class="mi">8992</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Julie</span> <span class="n">Firrelli</span><span class="o">|</span> <span class="n">Sales</span><span class="o">|</span> <span class="mi">9181</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Larry</span> <span class="n">Bott</span><span class="o">|</span> <span class="n">SCM</span><span class="o">|</span> <span class="mi">11798</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Leslie</span> <span class="n">Jennings</span><span class="o">|</span> <span class="n">IT</span><span class="o">|</span> <span class="mi">8113</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Leslie</span> <span class="n">Thompson</span><span class="o">|</span> <span class="n">IT</span><span class="o">|</span> <span class="mi">5186</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Loui</span> <span class="n">Bondur</span><span class="o">|</span> <span class="n">SCM</span><span class="o">|</span> <span class="mi">10449</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Mary</span> <span class="n">Patterson</span><span class="o">|</span><span class="n">Accounting</span><span class="o">|</span> <span class="mi">9998</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Pamela</span> <span class="n">Castillo</span><span class="o">|</span> <span class="n">SCM</span><span class="o">|</span> <span class="mi">11303</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Steve</span> <span class="n">Patterson</span><span class="o">|</span> <span class="n">Sales</span><span class="o">|</span> <span class="mi">9441</span><span class="o">|</span>
<span class="o">|</span><span class="n">William</span> <span class="n">Patterson</span><span class="o">|</span><span class="n">Accounting</span><span class="o">|</span> <span class="mi">8870</span><span class="o">|</span>
<span class="o">+</span><span class="c1">-----------------+----------+------+</span>
<span class="k">SELECT</span>
<span class="n">department</span><span class="p">,</span>
<span class="n">percentile_cont</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">25</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">salary</span><span class="p">)</span> <span class="k">AS</span> <span class="n">pc1</span><span class="p">,</span>
<span class="n">percentile_cont</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">25</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">salary</span><span class="p">)</span> <span class="n">FILTER</span> <span class="p">(</span><span class="k">WHERE</span> <span class="n">employee_name</span> <span class="k">LIKE</span> <span class="s1">'%Bo%'</span><span class="p">)</span> <span class="k">AS</span> <span class="n">pc2</span><span class="p">,</span>
<span class="n">percentile_cont</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">25</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">salary</span> <span class="k">DESC</span><span class="p">)</span> <span class="k">AS</span> <span class="n">pc3</span><span class="p">,</span>
<span class="n">percentile_cont</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">25</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">salary</span> <span class="k">DESC</span><span class="p">)</span> <span class="n">FILTER</span> <span class="p">(</span><span class="k">WHERE</span> <span class="n">employee_name</span> <span class="k">LIKE</span> <span class="s1">'%Bo%'</span><span class="p">)</span> <span class="k">AS</span> <span class="n">pc4</span><span class="p">,</span>
<span class="n">percentile_disc</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">25</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">salary</span><span class="p">)</span> <span class="k">AS</span> <span class="n">pd1</span><span class="p">,</span>
<span class="n">percentile_disc</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">25</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">salary</span><span class="p">)</span> <span class="n">FILTER</span> <span class="p">(</span><span class="k">WHERE</span> <span class="n">employee_name</span> <span class="k">LIKE</span> <span class="s1">'%Bo%'</span><span class="p">)</span> <span class="k">AS</span> <span class="n">pd2</span><span class="p">,</span>
<span class="n">percentile_disc</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">25</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">salary</span> <span class="k">DESC</span><span class="p">)</span> <span class="k">AS</span> <span class="n">pd3</span><span class="p">,</span>
<span class="n">percentile_disc</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">25</span><span class="p">)</span> <span class="n">WITHIN</span> <span class="k">GROUP</span> <span class="p">(</span><span class="k">ORDER</span> <span class="k">BY</span> <span class="n">salary</span> <span class="k">DESC</span><span class="p">)</span> <span class="n">FILTER</span> <span class="p">(</span><span class="k">WHERE</span> <span class="n">employee_name</span> <span class="k">LIKE</span> <span class="s1">'%Bo%'</span><span class="p">)</span> <span class="k">AS</span> <span class="n">pd4</span>
<span class="k">FROM</span> <span class="n">basic_pays</span>
<span class="k">GROUP</span> <span class="k">BY</span> <span class="n">department</span>
<span class="k">ORDER</span> <span class="k">BY</span> <span class="n">department</span><span class="p">;</span>
<span class="o">+</span><span class="c1">----------+-------+--------+-------+--------+-----+-----+-----+-----+</span>
<span class="o">|</span><span class="n">department</span><span class="o">|</span> <span class="n">pc1</span><span class="o">|</span> <span class="n">pc2</span><span class="o">|</span> <span class="n">pc3</span><span class="o">|</span> <span class="n">pc4</span><span class="o">|</span> <span class="n">pd1</span><span class="o">|</span> <span class="n">pd2</span><span class="o">|</span> <span class="n">pd3</span><span class="o">|</span> <span class="n">pd4</span><span class="o">|</span>
<span class="o">+</span><span class="c1">----------+-------+--------+-------+--------+-----+-----+-----+-----+</span>
<span class="o">|</span><span class="n">Accounting</span><span class="o">|</span><span class="mi">8543</span><span class="p">.</span><span class="mi">75</span><span class="o">|</span> <span class="mi">7838</span><span class="p">.</span><span class="mi">25</span><span class="o">|</span> <span class="mi">9746</span><span class="p">.</span><span class="mi">5</span><span class="o">|</span><span class="mi">10260</span><span class="p">.</span><span class="mi">75</span><span class="o">|</span> <span class="mi">8435</span><span class="o">|</span> <span class="mi">6627</span><span class="o">|</span> <span class="mi">9998</span><span class="o">|</span><span class="mi">11472</span><span class="o">|</span>
<span class="o">|</span> <span class="n">IT</span><span class="o">|</span><span class="mi">5917</span><span class="p">.</span><span class="mi">75</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span><span class="mi">7381</span><span class="p">.</span><span class="mi">25</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> <span class="mi">5186</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> <span class="mi">8113</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span>
<span class="o">|</span> <span class="n">Sales</span><span class="o">|</span><span class="mi">8550</span><span class="p">.</span><span class="mi">75</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> <span class="mi">9721</span><span class="p">.</span><span class="mi">5</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> <span class="mi">6660</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span><span class="mi">10563</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span>
<span class="o">|</span> <span class="n">SCM</span><span class="o">|</span><span class="mi">10449</span><span class="p">.</span><span class="mi">0</span><span class="o">|</span><span class="mi">10786</span><span class="p">.</span><span class="mi">25</span><span class="o">|</span><span class="mi">11303</span><span class="p">.</span><span class="mi">0</span><span class="o">|</span><span class="mi">11460</span><span class="p">.</span><span class="mi">75</span><span class="o">|</span><span class="mi">10449</span><span class="o">|</span><span class="mi">10449</span><span class="o">|</span><span class="mi">11303</span><span class="o">|</span><span class="mi">11798</span><span class="o">|</span>
<span class="o">+</span><span class="c1">----------+-------+--------+-------+--------+-----+-----+-----+-----+</span>
</code></pre></div></div>
<h3 id="related-statements">Related Statements</h3>
<ul>
<li><a href="sql-ref-syntax-qry-select.html">SELECT</a></li>
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