title: Mysql : syntax error after update mysql
body: <p>please advice whats the error in this statement, this statement was working fine before the last update for mysql </p>
  
  <pre><code>CREATE TABLE `users` (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
                        username VARCHAR(50),
                        password VARCHAR(500) NOT NULL,
                        full_name VARCHAR(50),
                        is_author BOOLEAN DEFAULT  ,
                        UNIQUE INDEX (username));
  </code></pre>
  
  <p>thanks in advance </p>