Start the console: mysql

List all databases: show databases;

Switch to a database: use $dbname;

List tables in a current database: show tables;

List columns in a given table: describe $tablename;

Setting permissions to a database: GRANT SELECT ON $database.* TO '$user_name'@'%' IDENTIFIED BY '$password';

Deleting rows: delete from $db.$table where $condition;

Selects: select count(*) from $db.$table;

Altering a table:

ALTER TABLE get_cookie_log ADD COLUMN log_id INT(10) NOT NULL auto_increment, ADD PRIMARY KEY(log_id);`
ALTER TABLE get_cookie_log ADD COLUMN log_id INT(10) NOT NULL auto_increment, ADD INDEX(log_id);`
ALTER TABLE verify_reg_code_log ADD COLUMN log_id INT(10) NOT NULL auto_increment, ADD INDEX(log_id);`

Backup database: mysqldump $database [[-all] | [$table]]s >$file-name.sql

Import database:

mysql -e "DROP DATABASE $db; CREATE DATABASE $db;"
mysql $databasename <$file-name.sql