How Can I link two mysql tables?

Question

is there a way to link two mysql tables so that a query to update one table will automatically add an entry to another table, for instance. whenever I update the radcheck.UserName table it will automatically add the same entry to userinfo.username (adding any default values as the entries are added)?

Answer 1

CREATE TRIGGER table_name AFTER INSERT ON table FOR EACH ROW BEGIN

    IF NEW.deleted THEN
        SET @changetype = 'DELETE';
    ELSE
        SET @changetype = 'NEW';
    END IF;

    INSERT INTO audit (table_id, changetype) VALUES (NEW.id, @changetype);

END$$