Many to many SQL

CREATE  TABLE IF NOT EXISTS `categories` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
  `name` VARCHAR(20) NOT NULL ,
  PRIMARY KEY (`id`) )
ENGINE = InnoDB;

CREATE  TABLE IF NOT EXISTS `events` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
  `title` VARCHAR(30) NOT NULL ,
  PRIMARY KEY (`event_id`))
ENGINE = InnoDB;

CREATE  TABLE IF NOT EXISTS `eventcategories` (
  `event_id` INT UNSIGNED NOT NULL ,
  `category_id` INT UNSIGNED NOT NULL ,
  INDEX `ecevent` (`event_id` ASC) ,
  INDEX `eccategory` (`category_id` ASC) ,
  CONSTRAINT `ecevent`
    FOREIGN KEY (`event_id` )
    REFERENCES `events` (`id` )
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT `eccategory`
    FOREIGN KEY (`category_id` )
    REFERENCES `categories` (`id` )
    ON DELETE RESTRICT
    ON UPDATE CASCADE)
ENGINE = InnoDB;