This view shows a list of authors along with their newest post and the date that it was published. But it does so using N+1 queries.
View the source code:
|J.D. Salinger||Franny and Zooey||1961-01-01|
|Charles Dickens||Barnaby Rudge||1841-01-01|
This Ruby on Rails app demonstrates the concepts encompassed in a series of blog posts about Greatest Per Group queries in Rails. You can view the source code on Github.