Question

I have Users Table which contains many fields including departmentid. departmentid is just a string . Each departmentid can have different users.Is it possible to find all departmentid from Users table without repetation.

I tried to find all departmentid from users table ,but the result contains duplication of departmentid.How to solve this .

Thanks in advance…

Answer 1

SQL

select distinct department_id from users

Ruby code

User.all.map(&:department_id).compact.uniq

also in rails 3

User.select('departement_id').uniq