1. Install RVM and Ruby
   • sudo apt-get install build-essential openssl libreadline6 libreadline6-dev curl git zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion git
   • curl -L https://get.rvm.io | bash -s stable --ruby
   • source ~/.rvm/scripts/rvm

1. Install Capistrano gems

DDL is short name of Data Definition Language, which deals with database schemas and descriptions, of how the data should reside in the database.

DML is short name of Data Manipulation Language which deals with data manipulation, and includes most common SQL statements such SELECT, INSERT, UPDATE, DELETE etc, and it is used to store, modify, retrieve, delete and update data in database.

DCL is short name of Data Control Language which includes commands such as GRANT, and mostly concerned with rights, permissions and other controls of the database system.

Text types

• http://www.sqlteaching.com/
• https://www.codecademy.com/learn/learn-sql

• MySQL-CLI
• Analyzing Business Metrics
• SQL joins infografic