S2OJ/web/app/upgrade/20_problem_difficulty/up.sql

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ALTER TABLE `problems` ADD `difficulty` int NOT NULL DEFAULT '-1' AFTER `submit_num`;
ALTER TABLE `problems` MODIFY `extra_config` json NOT NULL;
ALTER TABLE `problems` ADD KEY `difficulty` (`difficulty`);
	ALTER TABLE `problems` ADD `difficulty` int NOT NULL DEFAULT '-1' AFTER `submit_num`;
	ALTER TABLE `problems` MODIFY `extra_config` json NOT NULL;
	ALTER TABLE `problems` ADD KEY `difficulty` (`difficulty`);