Yii2 : Setting two values of Key in SqlDataProvider -

i have table have_schedule (many-to-many relations) in database contains foreign key tables :

table student : student_id, student_name

table schedule : sch_id, sch_day, sch_time

and

table have_schedule : student_id, sch_id

and want create dataprovider using sqldataprovider this

$dataprovider = new sqldataprovider([             'sql' => $sql,             'totalcount' => $n,             'key' => '', // <--------- key             'sort' => [                 'attributes' => [                     'student_name',                     'sch_day',                     'sch_time',                 ],             ],             'pagination' => [                 'pagesize' => 20,             ],         ]); 

the key used actioncolumn, example : /view?student_id=1&sch_id=2.

how set key's value student_id , sch_id ?

the simplest way not create/use actioncolumn, instead can use raw-column , show there want:

[    'attribute' => 'some_title',    'format' => 'raw',    'value' => function ($model) {                              return '<a href="'.$yoururl .'">your text</a>';    }, ],