EnglishWhen I worked on Best Tech Videos with Alexey Kovyrin, we faced a problem of filtering videos by category with selecting posts categories in the same query. It was easy to solve the problem, but there is one query optimization trick exists.
Using sub-queries to avoid multiple DB requests in Rails
Apr 12
2007 08:12
(Ruby on Rails) · 
(8,572 views)
(8,572 views) 
