MySQL Tutorials: Concept of NULL

Ruby Tutorials: how to use map or collect method

Ruby Tutorials: How to use instance_eval method

Ruby Tutorials: How to use 'each' method with hash

Ruby Tutorials: How to use 'each_with_index' method of Array

Ruby Tutorials: How to use 'class_eval' method in ruby

Ruby Tutorials: How to use each method

Ruby Tutorials: difference between kind_of? is_a? and instance_of?

Ruby Tutorials: What is false in Ruby

Ruby Tutorials: How to use super method in Ruby

Ruby Tutorials: Concept of Method Overloading

Ruby Tutorials: concept of method overriding in ruby

Ruby Tutorials: Concept of Inheritance

Ruby Tutorials: require_relative to read one ruby file from another

Ruby Tutorials: modules and module level functions

Ruby Tutorials: how to write and access CONSTANTS in ruby

MySQL Tutorial: WHERE clause with multiple AND/OR conditional clauses

MySQL Tutorials: DISTINCT to get distinct data from your table

MySQL Tutorials: UPDATE query to update data in MySQL tables

MySQL Tutorials: DELETE query to delete rows from MySQL table

MySQL Tutorials: Where clause to put conditions in queries

MySQL Tutorials: SELECT query to read data from MySQL table

MySQL Tutorials: INSERT query to insert data row by row

Ruby Tutorials: attr_accessor to get both reader and writer methods for attributes

Ruby Tutorials: attr_writer to write instance variables