<p>In this post, we will see a comprehensive list of all the MongoDB commands you will ever need as a MongoDB beginner. This list covers almost all the most used commands in MongoDB.</p>
<p>I will assume that you are working inside a collection named 'comments' on a MongoDB database of your choice</p>
<h2>1. Database Commands</h2>
<h3>View all databases</h3>
<pre class="language-bash"><code>show dbs</code></pre>
<p>&lt;|AD|&gt;</p>
<h3>Create a new or switch databases&nbsp;</h3>
<pre class="language-bash"><code>use dbName</code></pre>
<h3>View current Database</h3>
<pre class="language-bash"><code>db</code></pre>
<h3>Delete Database&nbsp;</h3>
<pre class="language-javascript"><code>db.dropDatabase()</code></pre>
<h2>2. Collection Commands</h2>
<h3>Show Collections</h3>
<pre class="language-javascript"><code>show collections</code></pre>
<h3>Create a collection named 'comments'</h3>
<pre class="language-javascript"><code>db.createCollection('comments')</code></pre>
<h3>Drop a collection named 'comments'</h3>
<pre class="language-javascript"><code>db.comments.drop()</code></pre>
<h2>3. Row(Document) Commands</h2>
<h3>Show all Rows in a Collection&nbsp;</h3>
<pre class="language-javascript"><code>db.comments.find()</code></pre>
<h3>Show all Rows in a Collection (Prettified)</h3>
<pre class="language-javascript"><code>db.comments.find().pretty()</code></pre>
<h3>Find the first row matching the object</h3>
<pre class="language-javascript"><code>db.comments.findOne({name: 'Harry'})</code></pre>
<p>&lt;|AD|&gt;</p>
<h3>Insert One Row</h3>
<pre class="language-javascript"><code>db.comments.insert({
    'name': 'Harry',
    'lang': 'JavaScript',
    'member_since': 5
 })</code></pre>
<h3>Insert many Rows</h3>
<pre class="language-javascript"><code>db.comments.insertMany([{
    'name': 'Harry',
    'lang': 'JavaScript',
    'member_since': 5
    }, 
    {'name': 'Rohan',
    'lang': 'Python',
    'member_since': 3
    },
    {'name': 'Lovish',
    'lang': 'Java',
    'member_since': 4
}])</code></pre>
<h3><br>Search in a MongoDb Database</h3>
<pre class="language-javascript"><code>db.comments.find({lang:'Python'})</code></pre>
<h3>Limit the number of rows in output</h3>
<pre class="language-javascript"><code>db.comments.find().limit(2)</code></pre>
<h3>Count the number of rows in the output</h3>
<pre class="language-javascript"><code>db.comments.find().count()</code></pre>
<p>&lt;|AD|&gt;</p>
<h3>Update a row</h3>
<pre class="language-javascript"><code>db.comments.updateOne({name: 'Shubham'},
{$set: {'name': 'Harry',
    'lang': 'JavaScript',
    'member_since': 51
}}, {upsert: true})</code></pre>
<h3>Mongodb Increment Operator</h3>
<pre class="language-javascript"><code>db.comments.update({name: 'Rohan'},
{$inc:{
    member_since: 2
}})</code></pre>
<h3>Mongodb Rename Operator</h3>
<pre class="language-javascript"><code>db.comments.update({name: 'Rohan'},
{$rename:{
    member_since: 'member'
}})</code></pre>
<h3>Delete Row&nbsp;</h3>
<pre class="language-javascript"><code>db.comments.remove({name: 'Harry'})</code></pre>
<h3>Less than/Greater than/ Less than or Eq/Greater than or Eq</h3>
<pre class="language-javascript"><code>db.comments.find({member_since: {$lt: 90}})
</code></pre>
<pre class="language-javascript"><code>db.comments.find({member_since: {$lte: 90}})</code></pre>
<pre class="language-javascript"><code>db.comments.find({member_since: {$gt: 90}})</code></pre>
<pre class="language-javascript"><code>db.comments.find({member_since: {$gte: 90}})</code></pre>

All MongoDb commands you will ever need (MongoDb Cheatsheet)

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