find all posts including the word about
select all posts that are grouped by their created_at year
find the five wordiest posts
find the number of total comments across a user's posts
Find how many comments each user has made per post category

  * question 5 is still unfinished
Get a specific user's posts sorted by date of most recent comment
Get the 5 most-commented-on posts that were created in the last 7 days
got through the first six problems

  * I struggled with each of the final four problems for a bit, and made
  * the most progress on question 10. I tried to visualize all of the joins
  * together by creating and modifying a basic excel spreadsheet, but got stuck.
  * will take another look at it in the morning.
  * Otherwise I felt like something definitely clicked while working through this
  * homework!