<section>
 <h1 class="contains-headerlink leafygreen-ui-41fr9s" weight="medium">
  Aggregation Commands
  <a class="headerlink leafygreen-ui-1kepx47" href="#aggregation-commands" title="Permalink to this heading">
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   <div class="css-1btu0w3 evvkmar0" id="aggregation-commands">
   </div>
  </a>
 </h1>
 <div class="leafygreen-ui-a5yxub">
  <p class="css-1cmx2d4 ef7gu8j0">
   On this page
  </p>
  <ul class="css-1qb0mst ef7gu8j1">
   <li class="leafygreen-ui-1e7a0ei">
    <a class="lg-ui-0001 leafygreen-ui-e98ikf" href="#aggregation-commands-1" target="_self">
     <span>
      Aggregation Commands
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#aggregation-methods" target="_self">
     <span>
      Aggregation Methods
     </span>
    </a>
   </li>
  </ul>
 </div>
 <div class="leafygreen-ui-15mdk4" role="note">
  <h2 class="leafygreen-ui-6n7b7d">
   Note
  </h2>
  <div class="leafygreen-ui-9mycqc">
   <p class="leafygreen-ui-1kp3ins">
    For details on a specific operator, including syntax and examples,
click on the link to the operator's reference page.
   </p>
  </div>
 </div>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Aggregation Commands
   <a class="headerlink leafygreen-ui-1kepx47" href="#aggregation-commands-1" title="Permalink to this heading">
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    <div class="css-1btu0w3 evvkmar0" id="aggregation-commands-1">
    </div>
   </a>
  </h2>
  <div class="leafygreen-ui-skkc39" tabindex="0">
   <table class="leafygreen-ui-hr8lsv">
    <colgroup>
     <col style="width:30%"/>
     <col style="width:70%"/>
    </colgroup>
    <thead class="leafygreen-ui-a9ho40">
     <tr data-testid="leafygreen-ui-header-row">
      <th class="leafygreen-ui-1trtg6r" role="columnheader" scope="col">
       <div class="leafygreen-ui-ui0te9">
        <div>
         Name
        </div>
       </div>
      </th>
      <th class="leafygreen-ui-13uteka" role="columnheader" scope="col">
       <div class="leafygreen-ui-ui0te9">
        <div>
         Description
        </div>
       </div>
      </th>
     </tr>
    </thead>
    <tbody>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/command/aggregate/#mongodb-dbcommand-dbcmd.aggregate">
          <code class="leafygreen-ui-1l06pbn">
           aggregate
          </code>
         </a>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         Performs
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/core/aggregation-pipeline/#std-label-aggregation-pipeline">
          aggregation tasks
         </a>
         such as
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/operator/aggregation/group/#mongodb-pipeline-pipe.-group">
          <code class="leafygreen-ui-1l06pbn">
           $group
          </code>
         </a>
         using an aggregation pipeline.
        </div>
       </div>
      </td>
     </tr>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/command/count/#mongodb-dbcommand-dbcmd.count">
          <code class="leafygreen-ui-1l06pbn">
           count
          </code>
         </a>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         Counts the number of documents in a collection or a view.
        </div>
       </div>
      </td>
     </tr>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/command/distinct/#mongodb-dbcommand-dbcmd.distinct">
          <code class="leafygreen-ui-1l06pbn">
           distinct
          </code>
         </a>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         Displays the distinct values found for a specified key in a collection or a view.
        </div>
       </div>
      </td>
     </tr>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/command/mapReduce/#mongodb-dbcommand-dbcmd.mapReduce">
          <code class="leafygreen-ui-1l06pbn">
           mapReduce
          </code>
         </a>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         Performs
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/core/map-reduce/#std-label-map-reduce">
          map-reduce
         </a>
         aggregation for large data sets.
        </div>
       </div>
      </td>
     </tr>
    </tbody>
   </table>
  </div>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Aggregation Methods
   <a class="headerlink leafygreen-ui-1kepx47" href="#aggregation-methods" title="Permalink to this heading">
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     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
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    </div>
   </a>
  </h2>
  <div class="leafygreen-ui-skkc39" tabindex="0">
   <table class="leafygreen-ui-hr8lsv">
    <colgroup>
     <col style="width:30%"/>
     <col style="width:70%"/>
    </colgroup>
    <thead class="leafygreen-ui-a9ho40">
     <tr data-testid="leafygreen-ui-header-row">
      <th class="leafygreen-ui-1trtg6r" role="columnheader" scope="col">
       <div class="leafygreen-ui-ui0te9">
        <div>
         Name
        </div>
       </div>
      </th>
      <th class="leafygreen-ui-13uteka" role="columnheader" scope="col">
       <div class="leafygreen-ui-ui0te9">
        <div>
         Description
        </div>
       </div>
      </th>
     </tr>
    </thead>
    <tbody>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/db.collection.aggregate/#mongodb-method-db.collection.aggregate">
          <code class="leafygreen-ui-1l06pbn">
           db.collection.aggregate()
          </code>
         </a>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         Provides access to the
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/core/aggregation-pipeline/#std-label-aggregation-pipeline">
          aggregation pipeline
          <!-- -->
          .
         </a>
        </div>
       </div>
      </td>
     </tr>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/db.collection.mapReduce/#mongodb-method-db.collection.mapReduce">
          <code class="leafygreen-ui-1l06pbn">
           db.collection.mapReduce()
          </code>
         </a>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         Performs
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/core/map-reduce/#std-label-map-reduce">
          map-reduce
         </a>
         aggregation for large
data sets.
        </div>
       </div>
      </td>
     </tr>
    </tbody>
   </table>
  </div>
 </section>
</section>
