diff --git a/databases/mongodb.sh b/databases/mongodb.sh
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+# *****************************************************************************
+# BASICS
+# *****************************************************************************
+
+# Connect MongoDB Shell
+mongo # connects to mongodb://127.0.0.1:27017 by default
+mongo --host <host> --port <port> -u <user> -p <pwd> # omit the password if you want a prompt
+
+# Show All Databases
+show dbs
+
+
+# Show Current Database
+db
+
+
+# Create Or Switch Database
+use <database_name>
+
+
+# Drop Database
+db.dropDatabase()
+
+
+# Create Collection
+db.createCollection('posts')
+
+
+# Show Collections
+show collections
+
+
+# *****************************************************************************
+# CRUD
+# *****************************************************************************
+
+# Insert Row
+db.posts.insert({
+  title: 'Post One',
+  body: 'Body of post one',
+  category: 'News',
+  tags: ['news', 'events'],
+  user: {
+    name: 'John Doe',
+    status: 'author'
+  },
+  date: Date()
+})
+
+
+# Insert Multiple Rows
+db.posts.insertMany([
+  {
+    title: 'Post Two',
+    body: 'Body of post two',
+    category: 'Technology',
+    date: Date()
+  },
+  {
+    title: 'Post Three',
+    body: 'Body of post three',
+    category: 'News',
+    date: Date()
+  },
+  {
+    title: 'Post Four',
+    body: 'Body of post three',
+    category: 'Entertainment',
+    date: Date()
+  }
+])
+
+
+# Get All Rows
+db.posts.find()
+
+
+# Get All Rows Formatted
+db.posts.find().pretty()
+
+
+# Find One Row
+db.posts.findOne({ category: 'News' })
+
+
+# Find Rows
+db.posts.find({ category: 'News' })
+
+
+# Find Specific Fields
+db.posts.find({ title: 'Post One' }, {
+  title: 1,
+  author: 1
+})
+
+
+# Update Row
+db.posts.update({ title: 'Post Two' },
+{
+  title: 'Post Two',
+  body: 'New body for post 2',
+  date: Date()
+},
+{
+  upsert: true
+})
+
+
+# Update Specific Field
+db.posts.update({ title: 'Post Two' },
+{
+  $set: {
+    body: 'Body for post 2',
+    category: 'Technology'
+  }
+})
+
+
+# Delete Row
+db.posts.remove({ title: 'Post Four' })
+
+
+# *****************************************************************************
+# OTHER FUNCTIONS
+# *****************************************************************************
+
+# Sort Rows
+db.posts.find().sort({ title: 1 }).pretty() # asc
+db.posts.find().sort({ title: -1 }).pretty() # desc
+
+
+# Count Rows
+db.posts.find().count()
+db.posts.find({ category: 'news' }).count()
+
+
+# Limit Rows
+db.posts.find().limit(2).pretty()
+
+
+# Chaining
+db.posts.find().limit(2).sort({ title: 1 }).pretty()
+
+
+# Foreach
+db.posts.find().forEach(function(doc) {
+  print("Blog Post: " + doc.title)
+})
+
+
+# Increment Field (\$inc)
+db.posts.update({ title: 'Post Two' },
+{
+  $inc: {
+    likes: 5
+  }
+})
+
+
+# Rename Field
+db.posts.update({ title: 'Post Two' },
+{
+  $rename: {
+    likes: 'views'
+  }
+})
+
+
+# Sub-Documents
+db.posts.update({ title: 'Post One' },
+{
+  $set: {
+    comments: [
+      {
+        body: 'Comment One',
+        user: 'Mary Williams',
+        date: Date()
+      },
+      {
+        body: 'Comment Two',
+        user: 'Harry White',
+        date: Date()
+      }
+    ]
+  }
+})
+
+
+# Find By Element in Array (\$elemMatch)
+db.posts.find({
+  comments: {
+     $elemMatch: {
+       user: 'Mary Williams'
+       }
+    }
+  }
+)
+
+
+# Add Index
+db.posts.createIndex({ title: 1 })
+
+
+# Drop Index
+db.posts.dropIndex("title_1")
+
+
+# Hide/Unhide Indexes
+db.posts.hideIndex("title_1")
+db.posts.unhideIndex("title_1")
+
+
+# Text Search
+db.posts.find({
+  $text: {
+    $search: "\"Post O\""
+    }
+})
+
+
+# Greater & Less Than
+db.posts.find({ views: { $gt: 2 } })
+db.posts.find({ views: { $gte: 7 } })
+db.posts.find({ views: { $lt: 7 } })
+db.posts.find({ views: { $lte: 7 } })