| title | length | tags |
|---|---|---|
Intro to SQL |
90 minutes |
SQL, PostgreSQL, database, Ruby |
By the end of this lesson, you will know/be able to:
| { | |
| "countries": [ | |
| { | |
| "country": "Afghanistan", | |
| "states": ["Badakhshan", "Badghis", "Baghlan", "Balkh", "Bamian", "Daykondi", "Farah", "Faryab", "Ghazni", "Ghowr", "Helmand", "Herat", "Jowzjan", "Kabul", "Kandahar", "Kapisa", "Khost", "Konar", "Kondoz", "Laghman", "Lowgar", "Nangarhar", "Nimruz", "Nurestan", "Oruzgan", "Paktia", "Paktika", "Panjshir", "Parvan", "Samangan", "Sar-e Pol", "Takhar", "Vardak", "Zabol"] | |
| }, | |
| { | |
| "country": "Albania", | |
| "states": ["Berat", "Dibres", "Durres", "Elbasan", "Fier", "Gjirokastre", "Korce", "Kukes", "Lezhe", "Shkoder", "Tirane", "Vlore"] | |
| }, |
| module BinaryTree | |
| class Node | |
| attr_reader :word, :count, :left, :right | |
| include Enumerable | |
| def initialize(word) | |
| @word, @count = word, 1 | |
| end |