Remove duplicate records based on multiple columns?

Question

I\'m using Heroku to host my Ruby on Rails application and for one reason or another, I may have some duplicate rows.

Is there a way to delete duplicate records base

Answer 1

You can try this sql query, to remove all duplicate records but latest one

DELETE FROM users USING users user WHERE (users.name = user.name AND users.year = user.year AND users.trim = user.trim AND users.id < user.id);