[Rails] How to remove/hide duplicate entry

[Jade Zallao]

Im currently new in rails and using v 2.3.11

I would like to ask if how can I query entries without including their
duplicates?

class CreatesStudent < ActiveRecord::Migration
  def self.up
    create_table :students do |t|
      t.string :first_name
      t.string :middle_name
      t.string :last_name
      t.timestamps
    end
  end

  def self.down
    drop_table :profiles
  end
end

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