1. Question.count
2. Lingo.find(16)
3. Lingo.find_by_term("Linux"), Lingo.where(term: "Linux").first, Lingo.find_by(term: "Linux"), Lingo.where("term = ?", "Linux").first
4. Question.where(user_id: 67), User.find(67).questions
5. User.first(500).pluck(:last_name)
6.*question_count = Question.group(:user_id).count
   question_count.values.max
   question_count.select {|k, v| v == 10}

7. Question.last.destroy
8. answers = Question.pluck(:answer_text)
   answer_length = answers.map {|x| x.length}
   Question.all.select {|q| q.answer_text.length == answer_length.max}

   Question.order("LENGTH(answer_text) DESC").limit(1) (FOR JUST ONE)
9. User.where(subscribed: true)
10. User.where(subscribed: false).order(:created_at).pluck(:email)
11. Lingo.where("created_at < ?", '2017-01-01')
12. Question.first(55), Question.limit(55)
13. Question.last(105), Question.order(id: :desc).limit(105) *first one preserves ascending order*
14. Question.find(231).expert.first_name
15. User.create(first_name: "Some", last_name: "Guy", email: "someguy@gmail.com", password: "password", password_confirmation: "password")
16. User.create(first_name: "Some", last_name: "Guy", email: "someotherguy@gmail.com", password: "password", password_confirmation: "password", expert: true, expert_type: "Data Science")
17. COMING SOON
18. arr_q = Question.where(question_text: "")
    arr_q.each {|question| question.question_text = "string"; question.save}
19. User.create(first_name: "Some", last_name: "Guy", email: "someotherguy2@gmail.com", password: "password", password_confirmation: "password", expert: true, expert_type: "User Experience Design")
    User.find_by_expert_type("design").update_attributes(expert_type: "graphic design")
20. Question.where(user_id: 546).each {|q| q.destroy}
    User.find(546).destroy