I am encountering error while updating my table field 'delete' in MySQL

```
CREATE TABLE IF NOT EXISTS `student` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` text NOT NULL,
  `delete` varchar(3) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=29 ;

INSERT INTO `student` (`name`, `delete`) VALUES('newa', 'no')

```

`UPDATE SET delete='yes`

```
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set delete-'yes'' at line 1

```