SQL 出错，请大家告诉我哪错误
DROP TABLE IF EXISTS '##__exam_sc';
CREATE TABLE '##__exam_sc'{
'id' int(11) NOT NULL auto_increment,
'userid' varchar(20) NOT NULL,
'title' text NOT NULL,
'type' smallint(6) NOT NULL default '0',
'upid' int(11) NOT NULL default '0',
'xuanxiang' text NOT NULL,
'daan' text NOT NULL,
'jieda' text NOT NULL,
PRIMARY KEY ('id'),
FOREIGN KEY (userid) REFERENCES ##__exam_admin(userid)
}ENGINE=MyISAM DEFAULT CHARSET=gbk;

[解决办法]
IF EXISTS '##__exam_sc'