How to write SQL in a migration in Rails

Question

I have the following SQL which I need to do

CREATE TABLE cars_users2 AS SELECT DISTINCT * FROM cars_users;

DROP TABLE cars_users;

ALTER TABLE cars_users2 R         


        

Answer 1

I prefer here doc:

execute <<-SQL
  CREATE TABLE cars_users2 AS SELECT DISTINCT * FROM cars_users;
  DROP TABLE cars_users;
  ALTER TABLE cars_users2 RENAME TO cars_users;
SQL

notice: This only works for PostgreSQL, if you are using MySQL you should set CLIENT_MULTI_STATEMENTS for the adapter.