text: DROP PROCEDURE IF EXISTS lookupUsernameAndEmail;
  CREATE PROCEDURE lookupUsernameAndEmail(IN _username varchar(20), IN _email varchar(50))
  BEGIN
  SELECT
  	EXISTS (SELECT id FROM users WHERE email = _email LIMIT 1) AS emailExists,
  	EXISTS (SELECT id FROM users WHERE user_name = _username LIMIT 1) AS nameExists;
  END