CRUD and general administration of MongoDB databases.

MongoDB Reference

### Create, Read, Update and Delete

# SHOW DATABASES
> show databases
> show dbs

# DEFINE DATABASE FOR OPERATIONS
> use database_name

# CREATE DATABASE AND COLLECTIONS 
> use world
> db.createCollection("Africa")
> db.createCollection("Asia")
> db.createCollection("Europe")
> db.createCollection("NorAmerica")
> db.createCollection("SouAmerica")
> db.createCollection("Antarctica")
> db.createCollection("Australia")

# RENAME COLLECTIONS
> db.NorAmerica.renameCollection("NorthAmerica")
> db.SouAmerica.renameCollection("SouthAmerica")

# CREATE DOCUMENTS
> db.Europe.insertOne( {"Country":"France","Population":"66.009.000"})
> db.Europe.insertOne( {"Country":"CzechRepublic","Population":"10.056.000"})

# CREATE MULTIPLE DOCUMENTS
> db.NorthAmerica.insertOne( [{"Country":"Mexico","Population":"127.005.000"},{"Country":"USA","Population":"323.001.000"}] )
> db.Africa.insertOne( [{"Country":"Congo","Population":"78.074.000"},{"Country":"Angola","Population":"28.081.000"}] )

# FIND DOCUMENT
> db.Europe.find({Country:"CzechRepublic"})

# FIND DOCUMENT (Show Population FROM Country Mexico, without showing "_id" field)
> db.NorthAmerica.find({Country:"Mexico"},{Population:1,_id:0})

# UPDATE DOCUMENT (For Country USA, Update Value of "Population" Key)
> db.NorthAmerica.update({Country:"USA"},{$set:{Population:"323.001.999"}})

# UPDATE DOCUMENT - RENAME FIELD ON ALL DOCUMENTS
> db.Africa.update( {}, {$rename:{"Population":"Citizens"}}, {multi:true})

# REMOVE DOCUMENT
> db.Europe.remove({Country:"CzechRepublic"})


### System Management

# CREATE SUPER USER
> use admin
> db.createUser( {user:"mongo", pwd:"mongo", roles:["root"]} )

# SHOW USERS
> use admin
> db.getUsers()