我正在使用带有 codeigniter
框架的 mysql 数据库。
一次连接超过 5 个表。 MySql 查询很好并且可以正确生成结果,但是生成结果需要花费太多时间,大约 9-12 秒
。
如何增加查询的执行时间。
SELECT `questions`.* FROM `questions` LEFT JOIN `universities_questions` ON `questions`.`id` = `universities_questions`.`question_id` LEFT JOIN `courses_questions` ON `questions`.`id` = `courses_questions`.`question_id` LEFT JOIN `branches_questions` ON `questions`.`id` = `branches_questions`.`question_id` LEFT JOIN `subjects_questions` ON `questions`.`id` = `subjects_questions`.`question_id` LEFT JOIN `question_types_questions` ON `questions`.`id` = `question_types_questions`.`question_id` LEFT JOIN `questions_year` ON `questions`.`id` = `questions_year`.`question_id` WHERE `questions`.`status` = '1' GROUP BY `questions`.`id` ORDER BY `questions`.`id` DESC LIMIT 1
最佳答案
关于php - 如何增加mysql查询执行时间,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34194641/