mysql 常用sql语句

• 权限

1. 撤销权限
   revoke all on *.* from ‘root’@’192.168.0.197’ ;

2. 撤销权限
   revoke all on *.* from ‘xx_db’ @’%’;

3. 给指定用户赋予指定数据库select的权限

   grant select ON xx_db TO ‘user_xx’ @’%’ IDENTIFIED BY “password”;
   给指定用户赋予指定数据库所有的权限
   grant all privileges on xx_db.* to ‘user_xxb’ @’%’ identified by “password“;
   给所有用户赋予指定数据库所有权限
   grant select on *.* to ‘xx_db’ @’%’ identified by “password“;
   给所有用户赋予所有权限(远程访问，不限制在本机访问)
   grant all privileges on *.* to ‘user_xx‘ @’%’ identified by “password“;
   赋予grant的权限
   grant all privileges on *.* to ‘user_xx’ @’%’ WITH GRANT OPTION

   给指定用户赋予所有数据库的权限
   grant select on xx_db to ‘user_xx‘ @’%’ identified by “password“;

• 备份

           备份整库：

           mysqldump -h192.168.XX.XX -uroot -p –databases DB > DB_bak_`date +%y%m%d_%H:%M:%S`.sql

• 对比两个数据库的表以及记录是否一致：

          select * from INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA = ‘_db’ order by create_time desc;