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href="/UserGuide/V1.0.x/Operators-Functions/Lambda.html" aria-label="Lambda"><!---->Lambda<!----></a></li><li><a class="route-link nav-link vp-sidebar-link vp-sidebar-page" href="/UserGuide/V1.0.x/Operators-Functions/Data-Profiling.html" aria-label="Data Profiling"><!---->Data Profiling<!----></a></li><li><a class="route-link nav-link vp-sidebar-link vp-sidebar-page" href="/UserGuide/V1.0.x/Operators-Functions/Anomaly-Detection.html" aria-label="Anomaly Detection"><!---->Anomaly Detection<!----></a></li><li><a class="route-link nav-link vp-sidebar-link vp-sidebar-page" href="/UserGuide/V1.0.x/Operators-Functions/Data-Matching.html" aria-label="Data Matching"><!---->Data Matching<!----></a></li><li><a class="route-link nav-link vp-sidebar-link vp-sidebar-page" href="/UserGuide/V1.0.x/Operators-Functions/Frequency-Domain.html" aria-label="Frequency Domain"><!---->Frequency Domain<!----></a></li><li><a class="route-link nav-link vp-sidebar-link vp-sidebar-page" 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type="button"><!----><span class="vp-sidebar-title">Cluster</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">FAQ</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">Reference</span><span class="vp-arrow end"></span></button><!----></section></li></ul><!--[--><!----><!--]--></aside><!--[--><main id="main-content" class="vp-page"><!--[--><!--[--><!----><!--]--><!----><nav class="vp-breadcrumb disable"></nav><div class="vp-page-title"><h1><!---->Aggregate Functions</h1><div class="page-info"><!----><!----><span class="page-date-info" aria-label="Writing Date"><svg xmlns="http://www.w3.org/2000/svg" class="icon calendar-icon" viewBox="0 0 1024 1024" fill="currentColor" 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data-path="/UserGuide/V1.0.x/Operators-Functions/Aggregation.html" data-page-key="/UserGuide/V1.0.x/Operators-Functions/Aggregation.html">...</span></span><span class="page-reading-time-info" aria-label="Reading Time"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 1 min</span><meta property="timeRequired" content="PT1M"></span><!----><!----></div><hr></div><!----><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="aggregate-functions" tabindex="-1"><a class="header-anchor" href="#aggregate-functions"><span>Aggregate Functions</span></a></h1><p>Aggregate functions are many-to-one functions. They perform aggregate calculations on a set of values, resulting in a single aggregated result.</p><p>All aggregate functions except <code>COUNT()</code> ignore null values and return null when there are no input rows or all values are null. For example, <code>SUM()</code> returns null instead of zero, and <code>AVG()</code> does not include null values in the count.</p><p>The aggregate functions supported by IoTDB are as follows:</p><table><thead><tr><th>Function Name</th><th>Function Description</th><th>Allowed Input Data Types</th><th>Output Data Types</th></tr></thead><tbody><tr><td>SUM</td><td>Summation.</td><td>INT32 INT64 FLOAT DOUBLE</td><td>DOUBLE</td></tr><tr><td>COUNT</td><td>Counts the number of data points.</td><td>All types</td><td>INT</td></tr><tr><td>AVG</td><td>Average.</td><td>INT32 INT64 FLOAT DOUBLE</td><td>DOUBLE</td></tr><tr><td>EXTREME</td><td>Finds the value with the largest absolute value. Returns a positive value if the maximum absolute value of positive and negative values is equal.</td><td>INT32 INT64 FLOAT DOUBLE</td><td>Consistent with the input data type</td></tr><tr><td>MAX_VALUE</td><td>Find the maximum value.</td><td>INT32 INT64 FLOAT DOUBLE</td><td>Consistent with the input data type</td></tr><tr><td>MIN_VALUE</td><td>Find the minimum value.</td><td>INT32 INT64 FLOAT DOUBLE</td><td>Consistent with the input data type</td></tr><tr><td>FIRST_VALUE</td><td>Find the value with the smallest timestamp.</td><td>All data types</td><td>Consistent with input data type</td></tr><tr><td>LAST_VALUE</td><td>Find the value with the largest timestamp.</td><td>All data types</td><td>Consistent with input data type</td></tr><tr><td>MAX_TIME</td><td>Find the maximum timestamp.</td><td>All data Types</td><td>Timestamp</td></tr><tr><td>MIN_TIME</td><td>Find the minimum timestamp.</td><td>All data Types</td><td>Timestamp</td></tr></tbody></table><p><strong>Example:</strong> Count Points</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">select</span> <span class="token function">count</span><span class="token punctuation">(</span><span class="token keyword">status</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01<span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Result:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+-------------------------------+
|count(root.ln.wf01.wt01.status)|
+-------------------------------+
|                          10080|
+-------------------------------+
Total line number = 1
It costs 0.016s
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