1、统计指定数据库下表的数量

　　mysql > use information_schema;

　　mysql > SELECT count(TABLE_NAME) FROM information_schema.TABLES WHERE TABLE_SCHEMA='dbname';

2、命令行导入.sql文件

　　mysql > source /home/dbname.sql;

3、命令行查看表创建语句

　　mysql > show create table table_name G;

4、修改某张表的字符编码和某个字段的编码

　　mysql > alter table table_name DEFAULT CHARACTER SET utf8;

　　mysql > ALTER TABLE table_name CHANGE column_name column_name VARCHAR(36) CHARACTER SET utf8 NOT NULL;

　　　或者 ALTER TABLE table_name modify column_name VARCHAR(36) CHARACTER SET utf8 NOT NULL;

持续更新中...