如何使用DISTINCT为total_time_driven_at_this_trip获取具有最高值的唯一用户ID,还从另一个基于user_id的属于关系的表中提取user_name？
我试过这个……
- $this->set('tripNsws',$this->TripNsw->find('all',array('limit' => 20,'fields' => array('DISTINCT(TripNsw.user_id)','TripNsw.total_time_driven_at_this_trip'),'group' => array('TripNsw.user_id'),'order' => array('TripNsw.total_time_driven_at_this_trip desc'))));
但它不起作用.
我想你需要得到以下……
- SELECT DISTINCT(user_id),`total_time_driven_at_this_trip` FROM `trip_nsws` order by `total_time_driven_at_this_trip` desc
- // see below url
- http://book.cakePHP.org/1.3/view/1018/find
- array(
- 'conditions' => array('Model.field' => $thisValue),//array of conditions
- 'recursive' => 1,//int
- 'fields' => array('Model.field1','DISTINCT Model.field2'),//array of field names
- 'order' => array('Model.created','Model.field3 DESC'),//string or array defining order
- 'group' => array('Model.field'),//fields to GROUP BY
- 'limit' => n,//int
- 'page' => n,//int
- 'offset'=>n,//int
- 'callbacks' => true //other possible values are false,'before','after'
- )
- // or try this
- function some_function() {
- $total = $this->Article->find('count');
- $pending = $this->Article->find('count',array('conditions' => array('Article.status' => 'pending')));
- $authors = $this->Article->User->find('count');
- $publishedAuthors = $this->Article->find('count',array(
- 'fields' => 'DISTINCT Article.user_id','conditions' => array('Article.status !=' => 'pending')
- ));
- }
