mongo

mongo.js

//
// concept
database
  - collection(table)
    - document(row)
      - field(column)

//
// definition
// use [database name]
use [database name]

// show databases
show dbs

// show tables
show collections

// drop database
use [target database name]
db.dropDatabase()

// index

// create index
db.unicorns.ensureIndex({name: 1});

// drop index
db.unicorns.dropIndex({name: 1});

// unique index
db.unicorns.ensureIndex({name: 1}, {unique: true});

// comprex index
db.unicorns.ensureIndex({name: 1, vampires: -1});

// explain
db.unicorns.find().explain()