使用CONCAT()函数 mysql向表中某字段后追加一段字符串(field为字段名): update table_name set field=CONCAT(field,'str',) mysql 向表中某字段前加字符串update table_name set field=CONCAT('str',field)…
本文介绍MySQL查看数据库表容量大小的命令语句,提供完整查询语句及实例,方便大家学习使用. 1.查看所有数据库容量大小 select table_schema as '数据库', sum(table_rows) as '记录数', , )) as '数据容量(MB)', , )) as '索引容量(MB)' from information_schema.tables group by table_schema order by sum(data_length) desc, sum(index…