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Create a new users table with the columns name and salary, run the command

rails generate migration CreateUsers name:string salary:decimal

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This will generate the below migration:

class CreateUsers < ActiveRecord::Migration[5.0]
  def change
    create_table :users do |t|
      t.string :name
      t.decimal :salary  
    end
  end
end

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When the migration name is of the form CreateWWW followed by list of columns with data types, then a migration will be generated that creates the table WWW with the listed columns.

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