ThinkPHP中关联查询（即多表联合查询）可以使用 table() 方法或和join方法，具体使用如下例所示：
1、原生查询示例：
$Model = new Model();
$sql = 'select a.id,a.title,b.content from think_test1 as a, think_test2 as b where a.id=b.id '.$map.' order by a.id '.$sort.' limit '.$p->firstRow.','.$p->listRows;
$voList = $Model->query($sql);
或者
$count=M("")->query("select count(*) from active left join service on active.sid=service.id where active.sid is not null");
$count=$count[0]['count(*)'];
$Page=new \Think\Page($count,10);
$ag=M("")->query("select active.*,service.title,service.price from active left join service on active.sid=service.id where active.sid is not null order by active.id desc limit ".$Page->firstRow.','.$Page->listRows);
$this->assign('ag',$ag);
$show=$Page->show();
$this->assign('page',$show);
$this->display();
2、join()方法示例：
$user = new Model('user');
$list = $user->join('RIGHT JOIN user_profile ON user_stats.id = user_profile.typeid' );
3、table()方法示例：
$list = $user->table('user_status stats, user_profile profile')->where('stats.id = profile.typeid')->field('stats.id as id, stats.display as display, profile.title as title,profile.content as content')->order('stats.id desc' )->select();