Mysql 8.0 OCP认证考试原题题库整理(CUUG内部资料)-第11题Choose the best answer.You have upgraded the MySQL binaries from 5.7.28 to 8.0.18 by using an in-place upgrade.Examine the message sequence generated during the first start of MySQL 8.0.18:Which step or set of steps will r...【阅读全文】
--查询-- 查询所有列 --select * from 表名 --一定条件查询(where) select * from students where id >= 5; -- 查询制定列 select name,age from students; -- 使用as给字段起别名 select name as '姓名', age as '年纪' from students;...【阅读全文】
博客文章除注明转载外,均为原创。转载请注明出处。本文链接地址:http://blog.chinaunix.net/uid-31396856-id-5787793.html1、介绍 MySQL 8.0实现了直方图的统计。数据字典表column_statistics储存了相关列值的直方图统计信息,提供列数据分布情况,以用于优化器构建查询执行计划。执行ANALYZE TAB...【阅读全文】