$sql="UPDATE `student`, SET `course`=`javascript`,`grade`=88,WHERE `id`=3";我换成ESC按键下面的反引号了,还有出错
出错提示:更新失败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 `course`=`javascript`,`grade`=88,WHERE `id`=3' at line 1