Consider the following DDL statement:
CREATE TABLE registrations ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, name VARCHAR(50) NOT NULL, create_date DATE NOT NULL, last_activity DATE NOT NULL );
Fill in the blanks so that the following select returns all registrations that were last active at least 30 days after being created.
SELECT name, create_date, last_activity FROM registrations WHERE >= (, INTERVAL 30 DAY);
See the example case for more details.