countBySql() 返回了最大id值？？ [ 新手入门 ]

const SQL_COUNT_OPERATORS = "select * FROM sp_operator, sp_department, sp_provider WHERE sp_operator.department_id = sp_department.id AND sp_department.provider_id = sp_provider.id AND sp_provider.id=:pid";

Operator::model()->countBySql(self::SQL_COUNT_OPERATORS, array(':pid'=>Yii::app()->user->id));

在数据库运行sql语句返回2条记录，运行程序却返回了最大id值？我用的1.1.6版本的Yii