mysql关于删除的命令实例源码。

(1)删除mysql数据库命令

drop database databasename; //删除数据库前，没有提示

mysqladmin drop databasename; //删除数据库前，有提示

(2)删除某张表命令

drop table tablename;

(3)清空某张表命令

delete from tablename;

(4)删除符合条件的某些记录语句

delete from tablename where id=xxx;

(5)删除授权语句

revoke all privileges on *.* from root@”%”;

delete from user where user=”root” and host=”%”;

flush privileges; //刷新数据库

(6)删除外键语句：

ALTER TABLE yourtablename DROP FOREIGN KEY fk_symbol;

(7)删除列命令

alter table table_name drop column_name; //删除表列