摘要: 1单库统计数据: select table_schema,sum(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 as mb from information_schema.tables group by table_schema; 2导出所有库中 阅读全文
posted @ 2021-01-18 18:45 linuxTang 阅读(87) 评论(0) 推荐(0)
摘要: 1concat()的作用: 可以实现拼接命令 mysql> select user,host from mysql.user; + + + | user | host | + + + | root | % | | tyjs09 | % | | zhihu | 10.0.0.% | | root | 阅读全文
posted @ 2021-01-18 18:18 linuxTang 阅读(63) 评论(0) 推荐(0)