db migrate rails code example

Example 1: how create migration rails

rails g migration AddPartNumberToProducts

Example 2: ruby on rails db migrate

rails db:migrate

Example 3: rials db down

bin/rails db:migrate:down VERSION=YYYYMMDDHHMMSS

Example 4: using SQL in rails migration

def change
  execute <<-SQL
    UPDATE table1
    SET column1 = "value"
  SQL
end