<h1 id="single-purpose-aggregation-methods"><a aria-hidden="true" class="anchor-heading icon-link" href="#single-purpose-aggregation-methods"></a>Single Purpose Aggregation Methods</h1>
<p>The single purpose aggregation methods aggregate documents from a single collection. The methods are simple but lack the capabilities of an aggregation pipeline.</p>





















<table><thead><tr><th>Method</th><th>Description</th></tr></thead><tbody><tr><td><a href="https://www.mongodb.com/docs/manual/reference/method/db.collection.estimatedDocumentCount/#mongodb-method-db.collection.estimatedDocumentCount">db.collection.estimatedDocumentCount()</a></td><td>Returns an approximate count of the documents in a collection or a view.</td></tr><tr><td><a href="https://www.mongodb.com/docs/manual/reference/method/db.collection.count/#mongodb-method-db.collection.count">db.collection.count()</a></td><td>Returns a count of the number of documents in a collection or a view.</td></tr><tr><td><a href="https://www.mongodb.com/docs/manual/reference/method/db.collection.distinct/#mongodb-method-db.collection.distinct">db.collection.distinct()</a></td><td>Returns an array of documents that have distinct values for the specified field.</td></tr></tbody></table>
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<strong>Backlinks</strong>
<ul>
<li><a href="/notes/b0my0ctxcg538xabcb6jo8j">Aggregation</a></li>
</ul>

Single Purpose Aggregation Methods

dendron_notes


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Method	Description
db.collection.estimatedDocumentCount()	Returns an approximate count of the documents in a collection or a view.
db.collection.count()	Returns a count of the number of documents in a collection or a view.
db.collection.distinct()	Returns an array of documents that have distinct values for the specified field.