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src=/images/external-link-icon.png width=14 height=14 alt="External link."></a></li></ul></li></ul></nav></div><nav class="page-nav clearfix" data-offset-top=90 data-offset-bottom=500><nav id=TableOfContents><ul><li><a href=#avg>AVG</a></li><li><a href=#count>COUNT</a></li><li><a href=#max>MAX</a></li><li><a href=#min>MIN</a></li><li><a href=#sum>SUM</a></li></ul></nav></nav><div class="body__contained body__section-nav"><h1 id=beam-zetasql-aggregate-functions>Beam ZetaSQL aggregate functions</h1><p>This page documents the ZetaSQL aggregate functions supported by Beam ZetaSQL.</p><div class=table-wrapper><table><thead><tr><th>Operator syntax</th><th>Description</th></tr></thead><tbody><tr><td><a href=#count>COUNT(*)</a></td><td>Returns the number of input rows</td></tr><tr><td><a href=#avg>AVG(FLOAT64)</a></td><td>Returns the average of non-<code>NULL</code> input values</td></tr><tr><td><a href=#sum>SUM(numeric)</a></td><td>Returns the sum of non-<code>NULL</code> values</td></tr><tr><td><a href=#max>MAX(value)</a></td><td>Returns the maximum non-<code>NULL</code> value</td></tr><tr><td><a href=#min>MIN(value)</a></td><td>Returns the minimum non-<code>NULL</code> value</td></tr></tbody></table></div><h2 id=avg>AVG</h2><pre tabindex=0><code>AVG(expression) |
| </code></pre><p><strong>Description</strong></p><p>Returns the average of non-<code>NULL</code> input values.</p><p><strong>Supported Argument Types</strong></p><p>FLOAT64. Note that, for floating point input types, the return result |
| is non-deterministic, which means you might receive a different result each time |
| you use this function.</p><p><strong>Returned Data Types</strong></p><ul><li>FLOAT64</li></ul><p><strong>Examples</strong></p><pre tabindex=0><code>SELECT AVG(x) as avg |
| FROM UNNEST([0, 2, NULL, 4, 4, 5]) as x; |
| |
| +-----+ |
| | avg | |
| +-----+ |
| | 3 | |
| +-----+ |
| </code></pre><h2 id=count>COUNT</h2><ol><li><p><code>COUNT(*)</code></p></li><li><p><code>COUNT(expression)</code></p></li></ol><p><strong>Description</strong></p><ol><li>Returns the number of rows in the input.</li><li>Returns the number of rows with <code>expression</code> evaluated to any value other |
| than <code>NULL</code>.</li></ol><p><strong>Supported Argument Types</strong></p><p><code>expression</code> can be any data type.</p><p><strong>Return Data Types</strong></p><p>INT64</p><p><strong>Examples</strong></p><pre tabindex=0><code>SELECT COUNT(*) AS count_star, COUNT(x) AS count_x |
| FROM UNNEST([1, 4, NULL, 4, 5]) AS x; |
| |
| +------------+---------+ |
| | count_star | count_x | |
| +------------+---------+ |
| | 5 | 4 | |
| +------------+---------+ |
| </code></pre><h2 id=max>MAX</h2><pre tabindex=0><code>MAX(expression) |
| </code></pre><p><strong>Description</strong></p><p>Returns the maximum value of non-<code>NULL</code> expressions. Returns <code>NULL</code> if there |
| are zero input rows or <code>expression</code> evaluates to <code>NULL</code> for all rows.</p><p><strong>Supported Argument Types</strong></p><p>Any data type except:</p><ul><li><code>ARRAY</code></li><li><code>STRUCT</code></li></ul><p><strong>Return Data Types</strong></p><p>Same as the data type used as the input values.</p><p><strong>Examples</strong></p><pre tabindex=0><code>SELECT MAX(x) AS max |
| FROM UNNEST([8, NULL, 37, 4, NULL, 55]) AS x; |
| |
| +-----+ |
| | max | |
| +-----+ |
| | 55 | |
| +-----+ |
| </code></pre><h2 id=min>MIN</h2><pre tabindex=0><code>MIN(expression) |
| </code></pre><p><strong>Description</strong></p><p>Returns the minimum value of non-<code>NULL</code> expressions. Returns <code>NULL</code> if there |
| are zero input rows or <code>expression</code> evaluates to <code>NULL</code> for all rows.</p><p><strong>Supported Argument Types</strong></p><p>Any data type except:</p><ul><li><code>ARRAY</code></li><li><code>STRUCT</code></li></ul><p><strong>Return Data Types</strong></p><p>Same as the data type used as the input values.</p><p><strong>Examples</strong></p><pre tabindex=0><code>SELECT MIN(x) AS min |
| FROM UNNEST([8, NULL, 37, 4, NULL, 55]) AS x; |
| |
| +-----+ |
| | min | |
| +-----+ |
| | 4 | |
| +-----+ |
| </code></pre><h2 id=sum>SUM</h2><pre tabindex=0><code>SUM(expression) |
| </code></pre><p><strong>Description</strong></p><p>Returns the sum of non-null values.</p><p>If the expression is a floating point value, the sum is non-deterministic, which means you might receive a different result each time you use this function.</p><p><strong>Supported Argument Types</strong></p><p>Any supported numeric data types.</p><p><strong>Return Data Types</strong></p><ul><li>Returns INT64 if the input is an integer.</li><li>Returns FLOAT64 if the input is a floating point |
| value.</li></ul><p>Returns <code>NULL</code> if the input contains only <code>NULL</code>s.</p><p><strong>Examples</strong></p><pre tabindex=0><code>SELECT SUM(x) AS sum |
| FROM UNNEST([1, 2, 3, 4, 5, 4, 3, 2, 1]) AS x; |
| |
| +-----+ |
| | sum | |
| +-----+ |
| | 25 | |
| +-----+ |
| </code></pre></div></div><footer class=footer><div class=footer__contained><div class=footer__cols><div class="footer__cols__col footer__cols__col__logos"><div class=footer__cols__col__logo><img src=/images/beam_logo_circle.svg class=footer__logo alt="Beam logo"></div><div class=footer__cols__col__logo><img src=/images/apache_logo_circle.svg class=footer__logo alt="Apache logo"></div></div><div class=footer-wrapper><div class=wrapper-grid><div class=footer__cols__col><div class=footer__cols__col__title>Start</div><div class=footer__cols__col__link><a href=/get-started/beam-overview/>Overview</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-java/>Quickstart (Java)</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-py/>Quickstart (Python)</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-go/>Quickstart (Go)</a></div><div class=footer__cols__col__link><a href=/get-started/downloads/>Downloads</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Docs</div><div class=footer__cols__col__link><a href=/documentation/programming-guide/>Concepts</a></div><div class=footer__cols__col__link><a href=/documentation/pipelines/design-your-pipeline/>Pipelines</a></div><div class=footer__cols__col__link><a href=/documentation/runners/capability-matrix/>Runners</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Community</div><div class=footer__cols__col__link><a href=/contribute/>Contribute</a></div><div class=footer__cols__col__link><a href=https://projects.apache.org/committee.html?beam target=_blank>Team<img src=/images/external-link-icon.png width=14 height=14 alt="External link."></a></div><div class=footer__cols__col__link><a href=/community/presentation-materials/>Media</a></div><div class=footer__cols__col__link><a href=/community/in-person/>Events/Meetups</a></div><div class=footer__cols__col__link><a href=/community/contact-us/>Contact Us</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Resources</div><div class=footer__cols__col__link><a href=/blog/>Blog</a></div><div class=footer__cols__col__link><a href=https://github.com/apache/beam>GitHub</a></div></div></div><div class=footer__bottom>© |
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