MySQL commands

To login to mysql without selecting a database
mysql -h hostname -u username -p
(hostname can be an IP addrress)

To create a new database, and user and grant permissions on that database to the new user.
create database moodle;
create user 'moodle'@'localhost' identified by 'password';
grant all privileges on moodle.* to 'moodle'@'localhost';

To run the sql script in the file text_file.sql in the database databasename:
mysql -h hostname -u username databasename -p < text_file.sql

To create a table:
CREATE TABLE categories (
    id        INTEGER PRIMARY KEY AUTO_INCREMENT,
    name    VARCHAR(64) NOT NULL,
    created_on    DATE,
    created_by    INTEGER REFERENCES user(id),
    modified_by    INTEGER REFERENCES user(id),
    modified_on    DATE   
);