yii去重

$criteria = new CDbCriteria;  

$criteria->alias = 't';  //table t，默認select='*';  

//一些public vars   

$criteria->select = 'id,parentid,name'; //代表了要查詢的字段，默認select='*';    

$criteria->join = 'xxx'; //連接表    

$criteria->with = 'xxx'; //調用relations   

$criteria->with = array('accounts','varchar');  

$criteria->with  = array('teacher'=>  

    array(
        'select'=>'username,company_id',  

        'order'=>'teacher.username ASC'
        )  

);  

$criteria->limit = 10;    //取1條數據，如果小於0，則不作處理    

$criteria->offset = 1;   //兩條合併起來，則表示 limit 10 offset 1,或者代表了。limit 1,10    

$criteria->order = 'xxx DESC,XXX ASC' ;//排序條件    

$criteria->group = 'group 條件';    

$criteria->having = 'having 條件 ';    

$criteria->distinct = FALSE; //是否唯一查詢  

Article::model()->findAll($criteria);