update users set age = 1 where id = 5;
update users set age = 2 where id = 6;
update users set age = 3 where id = 7;

DROP TABLE IF EXISTS t;

CREATE TABLE t (
  id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  firstname VARCHAR(30) NOT NULL,
  lastname VARCHAR(30) NOT NULL,
  email VARCHAR(50),
  reg_date TIMESTAMP
);