查询的一个问题

我的查询语句这么写：

$this->dao->select('account, sum(consumed) as consumption, count(taskid) as tasks')

    ->from(TABLE_CONSUMED)

    ->where('projectid')->eq($projectID)

    ->groupBy('account')

    ->fetchAll('account');
但是sql语句却成了这个样子：

The sql is: SELECT account, sum(consumed) as consumption, count(taskid) as tasks FROM `zt_consumed` wHeRe projectid = '5' AND `zt_consumed`.company = '1' gRoUp bY account

怎么就多出来一个条件呢zt_consumed`.company = '1'？好奇怪啊。。。
这是咋回事情哦？