CREATE TABLE IF NOT EXISTS `#__testquestions_subjects` (
  `id` int unsigned NOT NULL AUTO_INCREMENT,
  `title` varchar(150) NOT NULL,
  `published` tinyint NOT NULL DEFAULT 1,
  `ordering` int NOT NULL DEFAULT 0,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_title` (`title`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 DEFAULT COLLATE=utf8mb4_unicode_ci;

ALTER TABLE `#__testquestions_sets`
  ADD COLUMN `subject_id` int unsigned NOT NULL DEFAULT 0 AFTER `id`;